1136 Conjugatse, Desmidiacece, Micrasterias. 



cundatis. In Pistia stratiote pr. « Rangoon » in Birmania 

 Asia3 (R, RoMANis sec. Joshua). 



55. Micrasterias aiata Wall. Desm. from low. Bengal in Ann. Nat. 2726 

 Hist. 3 ser., vol. V, 1860, p. 279, t. XIlI, f. 11. — Paullo lon- 

 gior quam latior; semicellulis profunde trilobis, lobis lateralibus 

 profunde et a^qnaliter tripartitis ; lobo terminali furcato et valde 

 exserto. 



Hab. in Bengalia Asiae (Wallich). — Diraens. 145*140. 



Species inquirendsB. 



56. IVIicrasterias ? pusilia Wall. Desm. from low. Bengal in Ann. 2727 

 Nat. Hist. 3 ser., vol. V, 1860, p. 281, t. XIII, f. 13. — Cruci- 

 formis; semicellulis late eraarginatis, angulis inflatis et bidenta- 

 tis; sutura centrali inconspicua; parte raedia subinflata. 



Hah. in Bengalia Asia) (Hooker). — Dimens. 25 [x. 



57. Micrasterias? cruciata Wall. Desm. frora low. Bengal in Ann. 2728 

 Nat. Hist. 3 ser., vol. V, 1860, p. 281, t. XIII, f. 12. — Cruci- 

 forrais, sinu concavo in semicellulas 2 dichotomo-furcatas, sym- 

 raetrice lobatas divisa. 



Hab. in Bengalia Asiae (Wallich). — Diara. 50 p.. Apices tri- 

 dentati. 



STAURASTRUM Meyen [1829] in Nova Acta Leop. XIV, 2, p. 277 

 (Etym. stauros crux et asiron astrura) em. Ralfs [1848] Brit. Desm. 

 p. 149, Rabenh. Fl. Eur. Algar. III, p. 196, Kirchn. Alg. Schles. 

 p. 163, Cooke Brit. Desm. p. 138, WoIIe Desm. U. S. p. 119, De- 

 Toni e Levi Fl. Alg. Ven. III, p. 41, Hansg. Prodr. pag. 210, 

 Nordst. Freshw. Alg. of New Zealand. and Austral. p. 35, Di- 

 dymocladon Ralfs [1848] Brit. Desm. p. 144, Phycasi^^urn Kuetz. 

 [1845] Phyc. Gerra. p. 137, Asteroocanihiwn Kuetz. [1849] Spe- 

 cies Algarum pag. 183 p. p,, Stephanoxanthium Kuetz. [1849] 

 Species Algarura p. 184, Peniasterias Ehrenb. [1838] Infus.. Tri- 

 ceras Lobarz. [1840] in Linna^a XIV, p. 272, t. 5, f. 3?, Gonio- 

 cystis et Trigonocystis Hass. [J845] Brit. Freshw. Alg. p. 352. ■ — 

 Cellulae iucisura mediana profunda in partes duas symraetricas 

 (semicellulas) divisae; semicellul?e e vertice visas 3-6-pIuri-anguIa- 

 res vel radiatse, angulis obtuso-rotundatis, acutis vel cornifornii- 

 productis. Chlorophora axilia, subinde parietalia '), e taeniolis ge- 



1) Ex hoc charactere cl. Lundell subgenus Pleurenterium condidit. 



