Van Heurck -- Synopsis des Diatomées de Belgique -- Index
| Nitzschia | acicularis (Kütz.) W.Sm. | Page 185 | Plate 70 | Figure 6 | |
| Nitzschia | acicularis var. closterioides Grunow | Page -- | Plate 70 | Figure 9 | |
| Nitzschia | acula Hantzsch = Nitzschia dissipata var. acula (Hantzsch) Van Heurck | Page -- | Plate 63 | Figure 4 | |
| Nitzschia | acuminata (W.Sm.) Grunow | Page 173 | Plate 58 | Figure 16,17 | |
| Nitzschia | acuminata var. ? novae-hollandiae = Nitzschia novae-hollandiae Grunow | Page -- | Plate 58 | Figure 18 | |
| Nitzschia | acutiuscula Grunow = Nitzschia amphibia var. acutiuscula Grunow | Page -- | Plate 68 | Figure 19,20,21,22 | |
| Nitzschia | acutiuscula f. major, marina = Nitzschia amphibia var. acutiuscula f. major, marina Grunow | Page -- | Plate 68 | Figure 23 | |
| Nitzschia | adriatica Grunow = Nitzschia insignis var. adriatica Grunow | Page -- | Plate 61 | Figure 2 | |
| Nitzschia | affinis Grunow = Nitzschia angularis var. affinis Grunow | Page -- | Plate 62 | Figure 16 | |
| Nitzschia | amphibia Grunow | Page 184 | Plate 68 | Figure 15,16,17 | |
| Nitzschia | amphibia var. acutiuscula Grunow | Page -- | Plate 68 | Figure 19,20,21,22 | Note 159 |
| Nitzschia | amphibia var. acutiuscula f. major, marina | Page -- | Plate 68 | Figure 23 | |
| Nitzschia | amphibia var. ? fossilis Grunow | Page -- | Plate 68 | Figure 24 | |
| Nitzschia | amphibia var. frauenfeldii Grunow = Nitzschia frauenfeldii (Grunow) Grunow | Page -- | Plate 68 | Figure 18 | |
| Nitzschia | amphioxys W. Sm. = Hantzschia amphioxys (Ehrenb.) Grunow | Page 168 | Plate 56 | Figure 1,2 | Note 160 |
| Nitzschia | angularis W.Sm. | Page 177 | Plate 62 | Figure 11,12,13,14 | |
| Nitzschia | angularis var. affinis Grunow | Page 177 | Plate 62 | Figure 16 | |
| Nitzschia | angularis var. occidentalis Grunow | Page -- | Plate 62 | Figure 15 | |
| Nitzschia | angustata (W.Sm.) Grunow | Page 172 | Plate 57 | Figure 22,23,24 | |
| Nitzschia | angustata var. curta Grunow | Page 172 | Plate 57 | Figure 25 | |
| Nitzschia | apiculata (W.Greg.) Grunow | Page 173 | Plate 58 | Figure 26,27 | |
| Nitzschia | armoricana (Kütz.) Grunow = Nitzschia sigmoidea var. ? armoricana (Kütz.) Grunow | Page -- | Plate 63 | Figure 8 | |
| Nitzschia | balatonis Grunow | Page -- | Plate 57 | Figure 28 | |
| Nitzschia | bilobata W.Sm. | Page 175 | Plate 60 | Figure 1 | |
| Nitzschia | bilobata var. ? hybrida Grunow = Nitzschia hybdrida Grunow | Page -- | Plate 60 | Figure 4,5 | |
| Nitzschia | bilobata var. minor Grunow | Page 175 | Plate 60 | Figure 2,3 | |
| Nitzschia | birostrata W.Sm. = Nitzschia longissima (Bréb.) Ralfs | Page -- | Plate 70 | Figure 1,2 | |
| Nitzschia | bombiformis Grunow | Page -- | Plate 58 | Figure 9 | |
| Nitzschia | Brébissonii W.Sm. | Page 178 | Plate 64 | Figure 4,5 | |
| Nitzschia | brevissima Grunow = Nitzschia obtusa var. brevissima Grunow | Page -- | Plate 67 | Figure 4 | |
| Nitzschia | calida Grunow = Nitzschia tryblionella var. calida (Grunow) Van Heurck | Page 171 | Plate 59 | Figure 4,5 | |
| Nitzschia | circumsuta (Bailey) Grunow | Page 174 | Plate 59 | Figure 8 | |
| Nitzschia | clausii Hantzsch | Page -- | Plate 66 | Figure 10 | |
| Nitzschia | closterium (Ehrenb.) W.Sm. = Nitzschia longissima var. closterium (Ehrenb.) Van Heurck | Page 185 | Plate 70 | Figure 7,8 | |
| Nitzschia | closterium Eulenst. = Nitzschia reversa W.Sm. | Page -- | Plate 70 | Figure 10,11 | Note 161 |
| Nitzschia | closterium f. minutissima Grunow = Nitzschia longissima var. closterium (Ehrenb.) Van Heurck | Page -- | Plate 70 | Figure 5 | |
| Nitzschia | closterium var. [Grunow] = Nitzschia longissima var. closterium (Ehrenb.) Van Heurck | Page -- | Plate 70 | Figure 7,8 | |
| Nitzschia | coarctata Grunow | Page -- | Plate 57 | Figure 4 | |
| Nitzschia | communis Rabenh. | Page 184 | Plate 69 | Figure 32 | |
| Nitzschia | communis var. abbreviata Grunow | Page 184 | Plate 69 | Figure 35 | |
| Nitzschia | communis var. obtusa Grunow | Page 184 | Plate 69 | Figure 33,34 | |
| Nitzschia | commutata Grunow | Page 175 | Plate 59 | Figure 13,14 | |
| Nitzschia | constricta (W.Greg.) Grunow | Page 172 | Plate ? | Figure ? | |
| Nitzschia | constricta f. parva Grunow | Page 173 | Plate 58 | Figure 8 | |
| Nitzschia | constricta var. bombiformis Grunow = Nitzschia bombiformis Grunow | Page -- | Plate 58 | Figure 9 | |
| Nitzschia | constricta var. subconstricta Grunow | Page -- | Plate 58 | Figure 7 | |
| Nitzschia | cuneata Suringar = Nitzschia stagnorum (Rabenh.) Grunow | Page -- | Plate 59 | Figure 24 | |
| Nitzschia | cursoria (Donkin) Grunow | Page -- | Plate 62 | Figure 19 | |
| Nitzschia | debilis (Arn.) Grunow | Page 172 | Plate 57 | Figure 19,20,21 | |
| Nitzschia | delognei Grunow | Page 184 | Plate sC | Figure 38 | |
| Nitzschia | denticula Grunow | Page 175 | Plate 60 | Figure 10 | |
| Nitzschia | denticula var. delognei Grunow | Page 176 | Plate 60 | Figure 9 | |
| Nitzschia | dissipata (Kütz.) Grunow | Page 178 | Plate 63 | Figure 1 | |
| Nitzschia | dissipata var. acula (Hantzsch) Van Heurck | Page 178 | Plate 63 | Figure 4 | |
| Nitzschia | dissipata var. media (Hantzsch) Grunow | Page 178 | Plate 63 | Figure 2,3 | |
| Nitzschia | distans W.Greg. | Page -- | Plate 62 | Figure 10 | |
| Nitzschia | distans var. ? subsigmoidea Grunow | Page -- | Plate 62 | Figure 18 | |
| Nitzschia | distans var. tumescens Cleve et M?ller | Page -- | Plate 62 | Figure 17 | Note 162 |
| Nitzschia | dubia W.Sm. | Page 174 | Plate 59 | Figure 9,10,11,12 | |
| Nitzschia | dubia var. ? [W.Sm.], partim = Nitzschia commutata Grunow | Page -- | Plate 59 | Figure 13,14 | |
| Nitzschia | elegantula Grunow = Nitzschia microcephala var. elegantula (Grunow) Van Heurck | Page -- | Plate 69 | Figure 22a | |
| Nitzschia | elongata Hantzsch = Hantzschia amphioxys var. elongata (Hantzsch) Grunow | Page -- | Plate 56 | Figure 7,8 | |
| Nitzschia | elongata Hassall = Nitzschia sigmoidea (Nitzsch) W.Sm. | Page -- | Plate 63 | Figure 5,6,7 | |
| Nitzschia | epithemioides Grunow | Page -- | Plate 60 | Figure 6,7,8 | |
| Nitzschia | fasciculata (Grunow) Grunow | Page 179 | Plate 66 | Figure 11,12,13 | Note 163 |
| Nitzschia | fluminensis Grunow | Page -- | Plate 62 | Figure 3,4 | |
| Nitzschia | fluminensis var. majuscula Grunow = Nitzschia flumeniensis Grunow | Page -- | Plate 62 | Figure 5 | |
| Nitzschia | fonticola Grunow = Nitzschia palea var. fonticola Grunow | Page -- | Plate 69 | Figure 15,16,17,18,19,20 | |
| Nitzschia | fossilis Grunow = Nitzschia amphibia var. ? fossilis Grunow | Page -- | Plate 68 | Figure 24 | |
| Nitzschia | frauenfeldii (Grunow) Grunow | Page -- | Plate 68 | Figure 18 | |
| Nitzschia | frustulum (Kütz.) Grunow | Page 184 | Plate 68 | Figure 28,29 | |
| Nitzschia | frustulum (Kütz.) Grunow, [partim?] = Nitzschia frustulum var. perminuta Grunow | Page -- | Plate 68 | Figure 31 | Note 164 |
| Nitzschia | frustulum f. subserians Grunow | Page -- | Plate 69 | Figure 2 | Note 165 |
| Nitzschia | frustulum var. [Grunow] | Page -- | Plate 68 | Figure 27 | |
| Nitzschia | frustulum var. bulnheimiana (Rabenh.) Grunow | Page -- | Plate 68 | Figure 30 | |
| Nitzschia | frustulum var. glacialis Grunow | Page -- | Plate 69 | Figure 9 | |
| Nitzschia | frustulum var. hantzschiana (Rabenh.) Grunow = Nitzschia hantzschiana Rabenh. | Page -- | Plate 69 | Figure 1 | |
| Nitzschia | frustulum var. inconspicua Grunow | Page -- | Plate 69 | Figure 6 | |
| Nitzschia | frustulum var. minutula Grunow | Page 184 | Plate 69 | Figure 5 | |
| Nitzschia | frustulum var. perminuta Grunow | Page -- | Plate 68 | Figure 31 | |
| Nitzschia | frustulum var. perminuta f. curta Grunow | Page -- | Plate 69 | Figure 7 | |
| Nitzschia | frustulum var. perminuta f. striis parum densioribus Grunow | Page -- | Plate 69 | Figure 4 | |
| Nitzschia | frustulum var. perpusilla (Rabenh.) Grunow | Page 184 | Plate 69 | Figure 8 | Note 166 |
| Nitzschia | frustulum var. tenella Grunow | Page -- | Plate 69 | Figure 30 | |
| Nitzschia | glacialis Grunow = Nitzschia frustulum var. glacialis Grunow | Page -- | Plate 69 | Figure 9 | |
| Nitzschia | gracilis Hantzsch | Page -- | Plate 68 | Figure 11 | |
| Nitzschia | gracilis f. brevior, minus producta Grunow | Page -- | Plate 68 | Figure 12 | |
| Nitzschia | granulata Grunow | Page -- | Plate 57 | Figure 5 | |
| Nitzschia | hantzschiana Rabenh. | Page -- | Plate 69 | Figure 1 | |
| Nitzschia | heufleriana Grunow | Page -- | Plate 68 | Figure 13,14 | |
| Nitzschia | hungarica Grunow | Page 173 | Plate 58 | Figure 19,20,21,22 | |
| Nitzschia | hungarica var. linearis Grunow | Page -- | Plate 58 | Figure 23,24,25 | |
| Nitzschia | hyalina W.Greg. = Nitzschia spathulata var. hyalina (W.Greg.) Grunow | Page -- | Plate 62 | Figure 9 | |
| Nitzschia | hybrida Grunow | Page -- | Plate 60 | Figure 4,5 | |
| Nitzschia | inconspicua Grunow = Nitzschia frustulum var. minutula Grunow | Page -- | Plate 69 | Figure 6 | |
| Nitzschia | incrustans Grunow = Nitzschia lanceolata var. incrustans (Grunow) Grunow | Page -- | Plate 68 | Figure 5,6 | |
| Nitzschia | incurva Grunow = Nitzschia lorenziana var. incurva Grunow | Page -- | Plate 70 | Figure 13,14 | |
| Nitzschia | insignis var. adriatica Grunow | Page -- | Plate 61 | Figure 2 | |
| Nitzschia | insignis var. mediterranea Grunow | Page -- | Plate 61 | Figure 1 | |
| Nitzschia | insignis var. notabilis Grunow | Page -- | Plate 61 | Figure 5 | |
| Nitzschia | insignis var. ? smithii (Ralfs) Grunow | Page -- | Plate 61 | Figure 4 | |
| Nitzschia | insignis var. spathulifera Grunow | Page -- | Plate 61 | Figure 3 | |
| Nitzschia | intermedia Hantzsch | Page -- | Plate 69 | Figure 10 | |
| Nitzschia | intermedia f. bengalensis Grunow | Page -- | Plate 69 | Figure 11 | |
| Nitzschia | Kützingiana Hilse | Page -- | Plate 69 | Figure 24,25,26 | |
| Nitzschia | Kützingiana var. exilis Grunow | Page -- | Plate 69 | Figure 27 | |
| Nitzschia | lamprocampa Hantzsch | Page -- | Plate 64 | Figure 3 | |
| Nitzschia | lanceola (Grunow) Grunow | Page -- | Plate 57 | Figure 6 | |
| Nitzschia | lanceola var. ? minutula Grunow = Nitzschia minutula Grunow | Page -- | Plate 57 | Figure 7 | |
| Nitzschia | lanceolata W.Sm. | Page 182 | Plate 68 | Figure 1,2 | |
| Nitzschia | lanceolata f. minima Grunow | Page 182 | Plate 68 | Figure 4 | |
| Nitzschia | lanceolata f. minor Grunow | Page 182 | Plate 68 | Figure 3 | |
| Nitzschia | lanceolata var. incrustans (Grunow) Grunow | Page 182 | Plate 68 | Figure 5,6 | |
| Nitzschia | latiuscula Grunow = Nitzschia sigma var. ? latiuscula Grunow | Page -- | Plate 65 | Figure 3 | |
| Nitzschia | levidensis W.Sm. = Nitzschia tryblionella var. levidensis (W.Sm.) Grunow | Page 171 | Plate 57 | Figure 15 | |
| Nitzschia | levidensis ? = ? Nitzschia tryblionella var. levidensis (W.Sm.) Grunow | Page -- | Plate 59 | Figure 7 | Note 167 |
| Nitzschia | levidensis f. minores densius striatae Grunow = Nitzschia tryblionella var. levidensis f. minores densius striatae Grunow | Page -- | Plate 57 | Figure 16,17 | |
| Nitzschia | liebetruthii Rabenh. | Page -- | Plate 68 | Figure 25,26 | |
| Nitzschia | liebetruthii var. [Grunow] | Page -- | Plate 69 | Figure 3 | |
| Nitzschia | linearis (C.Agardh) W.Sm. | Page 181 | Plate 67 | Figure 13,14,15 | |
| Nitzschia | linearis var. tenuis (W.Sm.) Grunow | Page 181 | Plate 67 | Figure 16 | |
| Nitzschia | littoralis Grunow = Nitzschia tryblionella var. littoralis (Grunow) Grunow | Page 172 | Plate 59 | Figure 1,2,3 | |
| Nitzschia | littorea Grunow = Nitzschia thermalis var. ? littorea Grunow | Page -- | Plate 59 | Figure 21 | |
| Nitzschia | littorea var. parva Grunow | Page -- | Plate 59 | Figure 25 | |
| Nitzschia | longissima (Bréb.) Ralfs | Page 185 | Plate 70 | Figure 1,2 | |
| Nitzschia | longissima f. parva Grunow | Page 185 | Plate 70 | Figure 3 | |
| Nitzschia | longissima var. closterium (Ehrenb.) Van Heurck | Page 185 | Plate 70 | Figure 5,7,8 | |
| Nitzschia | longissima var. reversa Grunow | Page -- | Plate 70 | Figure 4 | |
| Nitzschia | lorenziana Grunow | Page 185 | Plate 70 | Figure 12 | |
| Nitzschia | lorenziana var. incurva Grunow | Page 185 | Plate 70 | Figure 13,14 | |
| Nitzschia | macilenta W.Greg. | Page -- | Plate 64 | Figure 6,7 | Note 168 |
| Nitzschia | major Grunow = Nitzschia sigma var. ? major Grunow | Page -- | Plate 65 | Figure 6 | |
| Nitzschia | majuscula Grunow | Page -- | Plate 62 | Figure 5 | |
| Nitzschia | marginulata Grunow | Page -- | Plate 58 | Figure 13 | |
| Nitzschia | marginulata var. didyma f. parva Grunow | Page -- | Plate 58 | Figure 15 | |
| Nitzschia | marginulata var. didyma Grunow | Page -- | Plate 58 | Figure 14 | |
| Nitzschia | marginulata var. subconstricta Grunow | Page -- | Plate 58 | Figure 12 | |
| Nitzschia | marina Grunow | Page -- | Plate 57 | Figure 26,27 | |
| Nitzschia | maxima Grunow | Page -- | Plate 65 | Figure 1,2 | |
| Nitzschia | media Hantzsch = Nitzschia dissipata var. media (Hantzsch) Grunow | Page -- | Plate 63 | Figure 2,3 | |
| Nitzschia | microcephala Grunow | Page 183 | Plate 69 | Figure 21 | |
| Nitzschia | microcephala var. elegantula (Grunow) Van Heurck | Page 183 | Plate 69 | Figure 22a | |
| Nitzschia | minuta Bleisch = Nitzschia palea var. minuta (Bleisch) Grunow | Page -- | Plate 69 | Figure 23 | |
| Nitzschia | minutissima W.Sm. ? = Nitzschia dissipata (Kütz.) Grunow. | Page 178 | Plate 63 | Figure 1 | |
| Nitzschia | minutula Grunow | Page -- | Plate 57 | Figure 7 | |
| Nitzschia | minutula Grunow = Nitzschia frustulum var. minutula Grunow | Page -- | Plate 69 | Figure 5 | |
| Nitzschia | nana Grunow = Nitzschia obtusa var. nana Grunow | Page -- | Plate 67 | Figure 3 | |
| Nitzschia | navicularis (Bréb.) Grunow | Page 171 | Plate 57 | Figure 1 | |
| Nitzschia | notabilis Grunow = Nitzschia insignis var. notabilis Grunow | Page -- | Plate 61 | Figure 5 | |
| Nitzschia | novae-hollandiae Grunow | Page -- | Plate 58 | Figure 18 | |
| Nitzschia | obtusa W.Sm. | Page 180 | Plate 67 | Figure 1 | |
| Nitzschia | obtusa var. brevissima Grunow | Page 180 | Plate 67 | Figure 4 | |
| Nitzschia | obtusa var. nana Grunow | Page 180 | Plate 67 | Figure 3 | |
| Nitzschia | obtusa var. scalpelliformis Grunow | Page 180 | Plate 67 | Figure 2 | |
| Nitzschia | obtusa var. ? schweinfurthii Grunow | Page -- | Plate 67 | Figure 5,6 | |
| Nitzschia | ovalis Arn. | Page -- | Plate 69 | Figure 36 | |
| Nitzschia | palea (Kütz.) W.Sm. | Page 183 | Plate 69 | Figure 22bc | |
| Nitzschia | palea var. debilis (Kütz.) Grunow | Page 183 | Plate 69 | Figure 28,29 | |
| Nitzschia | palea var. fonticola Grunow | Page 183 | Plate 69 | Figure 15,16,17,18,19,20 | |
| Nitzschia | palea var. ? kützingiana (Hilse) Grunow = Nitzschia kützingiana Hilse | Page -- | Plate 69 | Figure 24,25,26 | |
| Nitzschia | palea var. minuta (Bleisch) Grunow | Page -- | Plate 69 | Figure 23 | |
| Nitzschia | palea var. tenuirostris Grunow | Page 183 | Plate 69 | Figure 31 | |
| Nitzschia | paleacea Grunow = Nitzschia subtilis var. paleacea Grunow | Page -- | Plate 68 | Figure 9,10 | |
| Nitzschia | panduriformis W.Greg | Page 172 | Plate 58 | Figure 1,2,3,4 | Note 169 |
| Nitzschia | panduriformis var. continua Grunow | Page -- | Plate 58 | Figure 6 | |
| Nitzschia | panduriformis var. delicatula Grunow | Page -- | Plate 58 | Figure 5 | |
| Nitzschia | panduriformis var. minor Grunow = Nitzschia panduriformis W.Greg. | Page -- | Plate 58 | Figure 4 | Note 170 |
| Nitzschia | paradoxa (J.F.Gmel.) Grunow | Page 176 | Plate 61 | Figure 6 | |
| Nitzschia | paradoxa f. major latior Grunow | Page -- | Plate 61 | Figure 7 | |
| Nitzschia | parva W. Sm. ? = Nitzschia littorea var. parva Grunow | Page -- | Plate 59 | Figure 25 | |
| Nitzschia | parvula Lewis = Nitzschia obtusa var. brevissima Grunow | Page -- | Plate 67 | Figure 4 | |
| Nitzschia | perminuta f. curta Grunow = Nitzschia frustulum var. perminuta f. curta Grunow | Page -- | Plate 69 | Figure 7 | |
| Nitzschia | perminuta f. striis parum densioribus Grunow = Nitzschia frustulum var. perminuta f. striis parum densioribus Grunow | Page -- | Plate 69 | Figure 4 | |
| Nitzschia | perpusilla Grunow = Nitzschia liebetruthii Rabenh. | Page -- | Plate 68 | Figure 25,26 | |
| Nitzschia | perpusilla Rabenh. = Nitzschia frustulum var. perpusilla (Rabenh.) Grunow | Page -- | Plate 69 | Figure 8 | |
| Nitzschia | petitiana Grunow | Page 177 | Plate 62 | Figure 6 | |
| Nitzschia | plana W.Sm. | Page 173 | Plate 58 | Figure 10,11 | |
| Nitzschia | punctata (W.Sm.) Grunow | Page 171 | Plate 57 | Figure 2 | |
| Nitzschia | punctata var. coarctata Grunow = Nitzschia coarctata Grunow | Page -- | Plate 57 | Figure 4 | |
| Nitzschia | punctata var. elongata Grunow | Page 171 | Plate 57 | Figure 3 | |
| Nitzschia | quarnerensis Grunow., partim = Nitzschia distans var. tumescens Cleve et M?ller | Page -- | Plate 62 | Figure 17 | |
| Nitzschia | recta Hantzsch = Nitzschia vitrea var. recta (Hantzsch) Grunow | Page 182 | Plate 67 | Figure 17,18 | |
| Nitzschia | reversa W. Sm.?? = Nitzschia longissima var. reversa Grunow | Page -- | Plate 70 | Figure 4 | |
| Nitzschia | romana Grunow | Page -- | Plate 69 | Figure 12,13 | Note 171 |
| Nitzschia | rostrata Grunow = Nitzschia reversa W.Sm. | Page -- | Plate 70 | Figure 10,11 | Note 172 |
| Nitzschia | salinarum Grunow = Nitzschia tryblionella var. salinarum Grunow | Page -- | Plate 57 | Figure 18 | |
| Nitzschia | salinarum Grunow = Nitzschia vitrea var. salinarum Grunow | Page -- | Plate 67 | Figure 12 | |
| Nitzschia | scalaris (Ehrenb.) W.Sm. | Page -- | Plate 60 | Figure 14,15 | |
| Nitzschia | schweinfurthii Grunow = Nitzschia obtusa var. ? schweinfurthii Grunow | Page -- | Plate 67 | Figure 5,6 | |
| Nitzschia | serians (Bréb.) Rabenh. [sensu Grunow in Van Heurck] = Nitzschia thermalis f. brevis ? Grunow | Page -- | Plate 59 | Figure 23 | Note 173 |
| Nitzschia | sigma (Kütz.) W.Sm. | Page 179 | Plate 65 | Figure 7,8 | |
| Nitzschia | sigma? f. elongatae Grunow = Nitzschia sigma var. sigmatella (W.Greg.) Grunow | Page -- | Plate 66 | Figure 7 | |
| Nitzschia | sigma var. diminuta Grunow | Page -- | Plate 66 | Figure 9 | |
| Nitzschia | sigma var. habirshawii f. brevior Grunow | Page -- | Plate 66 | Figure 4 | |
| Nitzschia | sigma var. intercedens Grunow | Page 179 | Plate 66 | Figure 1 | |
| Nitzschia | sigma var. ? latiuscula Grunow | Page -- | Plate 65 | Figure 3 | |
| Nitzschia | sigma var. ? major Grunow | Page -- | Plate 65 | Figure 6 | |
| Nitzschia | sigma var. ? maxima Grunow = Nitzschia maxima Grunow | Page -- | Plate 65 | Figure 1,2 | |
| Nitzschia | sigma var. rigida (Kütz.) Grunow | Page 179 | Plate 66 | Figure 2,3?,5 | Note 174 |
| Nitzschia | sigma var. rigidula Grunow | Page 179 | Plate 66 | Figure 8 | |
| Nitzschia | sigma var. sigmatella (W.Greg.) Grunow | Page 179 | Plate 66 | Figure 3?,6,7 | Note 175 |
| Nitzschia | sigma var. ? valida f. longissima Grunow = Nitzschia valida f. longissima Grunow | Page -- | Plate 65 | Figure 4,5 | |
| Nitzschia | sigmoidea (Nitzsch) W.Sm. | Page 178 | Plate 63 | Figure 5,6,7 | Note 176 |
| Nitzschia | sigmoidea var. ? armoricana (Kütz.) Grunow | Page -- | Plate 63 | Figure 8 | |
| Nitzschia | sinuata (W.Sm.) Grunow | Page 176 | Plate 60 | Figure 11 | |
| Nitzschia | sinuata var. tabellaria (Grunow) Grunow | Page 176 | Plate 60 | Figure 12,13 | Note 177 |
| Nitzschia | smithii Ralfs = Nitzschia insignis var. ? smithii (Ralfs) Grunow | Page -- | Plate 61 | Figure 4 | |
| Nitzschia | socialis W.Greg. | Page -- | Plate 61 | Figure 8 | |
| Nitzschia | spathulata Bréb. | Page 177 | Plate 62 | Figure 7,8 | |
| Nitzschia | spathulata var. hyalina (W.Greg.) Grunow | Page 177 | Plate 62 | Figure 9 | |
| Nitzschia | spathulifera Grunow = Nitzschia insignis var. spathulifera Grunow | Page -- | Plate 61 | Figure 3 | |
| Nitzschia | spectabilis (Ehrenb.) Ralfs | Page 180 | Plate 67 | Figure 8,9 | |
| Nitzschia | spectabilis W.Sm. = Nitzschia insignis var. ? smithii (Ralfs) Grunow | Page -- | Plate 61 | Figure 4 | |
| Nitzschia | stagnarum Rabenh. = Nitzschia stagnorum (Rabenh.) Grunow | Page -- | Plate 59 | Figure 24 | Note 178 |
| Nitzschia | stagnorum (Rabenh.) Grunow | Page -- | Plate 59 | Figure 24 | Note 179 |
| Nitzschia | subtilis (Kütz.) Grunow | Page 183 | Plate 68 | Figure 7,8 | |
| Nitzschia | subtilis var. paleacea Grunow | Page 183 | Plate 68 | Figure 9,10 | |
| Nitzschia | tabellaria (Grunow) Grunow = Nitzschia sinuata var. tabellaria (Grunow) Grunow | Page -- | Plate 60 | Figure 12,13 | Note 180 |
| Nitzschia | taenia W. Sm. = Cylindrotheca gracilis (Bréb.) Grunow. | Page 186 | Plate 80 | Figure 2 | |
| Nitzschia | tenuis Eulenst. = Nitzschia subtilis (Kütz.) Grunow | Page -- | Plate 68 | Figure 7,8 | Note 181 |
| Nitzschia | tenuis W.Sm. = Nitzschia linearis var. tenuis (W.Sm.) Grunow | Page -- | Plate 67 | Figure 16 | |
| Nitzschia | thermalis (Ehrenb.) Auersw. | Page 174 | Plate 59 | Figure 20 | Note 182 |
| Nitzschia | thermalis f. brevis ? Grunow | Page -- | Plate 59 | Figure 23 | |
| Nitzschia | thermalis var. intermedia Grunow | Page 175 | Plate 59 | Figure 15,16,17,18,19 | |
| Nitzschia | thermalis var. ? littorea Grunow | Page -- | Plate 59 | Figure 21 | |
| Nitzschia | thermalis var. minor Hilse | Page -- | Plate 59 | Figure 22 | |
| Nitzschia | tryblionella Hantzsch | Page 171 | Plate 57 | Figure 9,10 | |
| Nitzschia | tryblionella var. calida (Grunow) Van Heurck | Page 171 | Plate 59 | Figure 4,5 | |
| Nitzschia | tryblionella var. levidensis (W.Sm.) Grunow | Page 171 | Plate 57 | Figure 15 | |
| Nitzschia | tryblionella var. levidensis f. minores densius striatae Grunow | Page -- | Plate 57 | Figure 16,17 | |
| Nitzschia | tryblionella var. littoralis (Grunow) Grunow | Page 172 | Plate 59 | Figure 1,2,3 | |
| Nitzschia | tryblionella var. maxima Grunow | Page -- | Plate 57 | Figure 11,12,13 | |
| Nitzschia | tryblionella var. salinarum Grunow | Page -- | Plate 57 | Figure 18 | |
| Nitzschia | tryblionella var. ? salinarum Grunow | Page -- | Plate 59 | Figure 6 | |
| Nitzschia | tryblionella var. victoriae (Grunow) Grunow | Page -- | Plate 57 | Figure 14 | |
| Nitzschia | tubicola Grunow | Page -- | Plate 69 | Figure 14 | |
| Nitzschia | tumida Hantzsch = Nitzschia sinuata (W.Sm.) Grunow | Page -- | Plate 60 | Figure 11 | |
| Nitzschia | valida f. longissima Grunow | Page -- | Plate 65 | Figure 4,5 | |
| Nitzschia | vermicularis (Kütz.) Hantzsch | Page 178 | Plate 64 | Figure 1,2 | Note 183 |
| Nitzschia | vermicularis f. minor Grunow = Nitzschia vermicularis (Kütz.) Hantzsch | Page -- | Plate 64 | Figure 1 | |
| Nitzschia | vermicularis var. ? lamprocampa (Hantzsch) Grunow = Nitzschia lamprocampa Hantzsch | Page -- | Plate 64 | Figure 3 | |
| Nitzschia | vexans Grunow | Page -- | Plate 57 | Figure 8 | |
| Nitzschia | vidovichii (Grunow) Grunow | Page -- | Plate 67 | Figure 7 | |
| Nitzschia | virgata Roper = Hantzschia virgata (Roper) Grunow | Page -- | Plate 56 | Figure 12,13 | |
| Nitzschia | vitrea G.Norman | Page 181 | Plate 67 | Figure 10 | |
| Nitzschia | vitrea f. major Grunow | Page 181 | Plate 67 | Figure 11 | |
| Nitzschia | vitrea var. recta (Hantzsch) Grunow | Page 182 | Plate 67 | Figure 17,18 | |
| Nitzschia | vitrea var. salinarum Grunow | Page 182 | Plate 67 | Figure 12 | |
| Nitzschia | vivax Hantzsch = Hantzschia amphioxys var. vivax (Hantzsch) Grunow | Page 169 | Plate 56 | Figure 5,6 | |
| Nitzschia | vivax W.Sm. | Page -- | Plate 62 | Figure 1 | |
| Nitzschia | vivax f. minor Grunow | Page -- | Plate 62 | Figure 2 | |
| Nitzschia | vivax var. ? fluminensis Grunow = Nitzschia flumenensis Grunow | Page -- | Plate 62 | Figure 3,4 |