Bacillariei», Fragilariacea;, Fragilaria. 681 



Genus ulterius inquirendum. 



RHABDOSIRA Elir. [1869] in Abh. Berl. Akad. 1869, p. 44 (Etyra. 

 r/iabdos virga, baculus et seira funis), H. L. Sin. Synopsis des fa- 

 mill, des Diat. p. 36 sub Gen. XXX. — Frustula linearia, quadran- 

 gula, levia, recta, solitaria aut fasciculata, longitudinaliter ita in 

 series concatenata ut una alteri aut fasciculus fasciculo superposi- 

 ta et pedicello discreta sint. 



Obs. Desmogonio giijanensi Ehr. valde affines forma? pedicel- 

 iatse lateribus insequalibus et defectu striarum diversyo. 



1. Rhabdosira moluccensis Ehr. Abh. 1869, p. 52, t. 2, III, f. II.— 2im 



Frustulis linearibus, levibus, ex uno latere visis angustioribus, utrin- 

 que subcapitatis, ex altero lineari-quadrato-rectangulis, aequalibus, 

 striis nullis. 



Hab. viva in Spongilla in insula Borneensi lecta (Ehren- 

 berg). — Singula frustula 100 u.. longa, Sijnedrcu VlncE Ehr. for- 

 mam referunt. Pedicello suffulti articuli catenas 3-4 articulatas, 

 Desmogonio similes, formant. 



FRAGILARIA Lyngb. [1819] Hydrophjt. Dan. p. 182 em. (Etym. fra- 

 gilis ob frustula facile secedentia?), Rabenh. Fl. Eur. Algar. I, 

 p. 118, Kirchn. Alg. Schles. p. 206, Brun Diat. Alp. p. 118, V. 

 H. Syn. p. 155, De-Toni Osserv. tasson. Bacill. p. 906, Siaurosiro, 

 Ehr. [1841] in Ber. 1841, p. 224, Petit [188S] in Pell. Diat. p. 50, 

 Ralfsia 0'Meara [1876] Ir. Diat. p. 293 noii Berkele/, Diatomo- 

 sira Trev. [1848] Alg. coccot. p. 95, Temachium Wallr. [1833] 

 Fl. cr. Germ. II, p. 116, Nemaioplaia Bory [1821] Dict. class. I, 

 p. 593 p. p. — Valvae symmetrica?, ecostatse, polis conformibus ; 

 frustula rectangularia, in fascias vel catenas longas oonjuncta, de- 

 mum plus minus soluta. Pha3ophora granuliformia vel imperfecte 

 lamelliformia. 



Subgen. I Eu-Fragilaria : Valva} medio non tumidse, pseudoraphe angustis- 

 sima vel subinconspicua (Phaeophora typice granuliformia). 



Obs. Distinctiones aptiores inter Iiaec 2 subgenera inquirendte a mono- 

 graphis sunt. 



1. Fragllaria virescens Ralfs in Ann. and Mag. XII, tab. II, fig. 6, 2707 

 Kuetz. Bacill. t. 16, f. 4, Rabenh. Sussw. Diat. p. 33, t. 1, f. 1, 

 Alg. n. 35 549 et n. 1491, Bac. n. 1, Desraaz. Cr. Fr. ed. I, n. 

 1452 et ed. II, n. 1052, Grun. in Wien. Verhandl. 1862, p. 373, 



