Bacillarieri', Fragilariaceai, Clavicula. 695 



GRAMMONEMA Ag. [1832] Coiisp. Diat. p. 63 (Etym. gramma linea, 

 littera et nema filamentum), Rabenh. Fl. Eur. Algar. I, p. 124, 

 De-Toui Osserv. tasson. Bacill. pag. 906, Gt^ammatonema Kuetz. 

 [1843?] i'hyc. germ. p. 140, Fragilarice, Confervce, Arthrode- 

 smiy Nematoplatcc species auct. nonnull. veter. — Frustula e fa- 

 cie connectivali visa quadrangula. lineis binis arcuatis instructa, 

 iii fascias arcte conjuncta,- valva? oblongce v. lanceolatye, sub polis 

 leniter constrictae; pseudorhaphe nulla. 



Obs. Est quasi Fragilaria frustulis imperfecte siliceis. Genus 

 aqua) marin;« incola. 



I. Grammonema striatulum (Lyngb.) Ag. Consp. Diat. p. 63, Grun. 2799 

 Alg. Novara p. 13, Fragilaria striatula Lyngb. Hydrophyt Dan. 

 p. 183, t. 63, Arthrodesmus striatulus Ehr. in Ber. Berl. Akad. 

 1840, Nematoplata caudata Bory ia Dict. class. 1821 teste Kuet- 

 zing, Conferva striatula Juerg. Dec. 19, n. 6, Fragilaria ar- 

 cuata Schuin. Preuss. Diat. 1863, p. 184, f. 11, Grammatonema 

 striatulwn Kuetz. Pliyc. germ. p. 140, Grammonema Juergensii 

 Ag. Consp. cr. Diat. p. 63, Ralfs in Ann. Nat. Hist. 1844, p. 449, 

 t. 14, f. 5, 1845, p. 171. t. 19, f. 5, Pritch. Inf. pag. 778, t. 15, 

 f. 24-25, Rabenh. Fl. Eur. Algar. I, p. 124 (incl. var.), Fragila- 

 ria diatomoides Grev. in Harv. Brit. Alg. pag. 198, Fragilaria 

 aurea Carmich. in Harv, Brit. Alg. p. 198, Fragilaria Juergen- 

 sii Kuetz. Syn. Diat. p. 59. — Characteres generis; csespitulo di- 

 lute flavescente vel olivaceo-viridi ; frustulis 25-45 u., longis, val- 

 vis lanceolatis, utrinque obtusis, prope apices leniter constrictis. 



Hab. iii aquis marinis ad oras insul. Faroensium, Gallise, An- 

 glise, Hispanice, Germaniae, Groenlandice, Finmarchitie, Spetbergice, 

 algas, lapides et tignamenta portuum occupans; inter Entero- 

 morpham micrococcam ad S. Paulum maris australis, copiose 

 (Grunow). 



CLAVICULA Pant. [1886] Foss. Bacill. Ungarns 1, p. 37 (Etym. cla- 

 vicula, ob formam frustulir'), De-Toni Osserv. tasson. Bacill. p. 906. 



— Frustula elongata, polis incrassatis, areis duabus levibus lon- 

 gitudinalibus totam valvam percurrentibus, cuin fascia punctorum 

 centrali eL laterali donata. 



1. Clavlcula polymorpha Gruu. et Pant. Foss. Bacill. Ungarns I, p. 37. 2soo 



— Valvis elongatis, linearibus; puactis irregulariter dispositis, ver- 



