Myxophycese, Hefcerocystidese, Anabsena. 437 



ANAB^NA Itory [1822] Dict. I, p. 307 (Etyin. anahaino scando), Born. 

 et Flah. Rev.IV, p. 225, Wittr. in Wittr. etNordst. exs. n. 496, Nosto- 

 cJiis, Sph(t2rozygo2, Belonice, Schizonematis, Merizoniyrim, Byssi, 

 Cylindrosperini, Trichormi, Dolichospermi, Nodularice, Sper- 

 mosircu sp. — Trichomata :oqualia vel ad apices sensini aLtenna- 

 ta, evaginata vel vaginis s;i3pius evanescentibus cincta, libera vel 

 in stratuni nuicosum congesta. Celluho, apicales difformes. Hetero- 

 cysUu intercalares, plures. Spone .situs varii, modo heterocystis 

 utrin(|ue contigu;e, modo inter articulos solitariae vel calenat;ie. 



Sectio I. Triciiormus Ralfs Ann. of Nat. Hist. II, pag. 325 [1850]. — Sporae 

 sphsericee aiifc ovales. 



1. Anabaena variabilis Kuetz. Phyc. gen. p. 210, Phyc. germ. p. 171, 1013 

 Cooke Hritish Freshw. Water Alga^, pag. 236, tab. 93, fig. 2, Flah. 

 in W. et N. Alg. exs. n. 681 1 Hansgirg Prodr. H, p. 67, Born. et FI. 

 Rev. IV, p. 226, J. Schm. Cyan. Dan. p. 87, WoIIe Fresh. Alg. of U. 

 S. p. 287, t. CXCVIII, f. 29-32, Saund. in C. H. et Setch. Phyc. bor. 

 Amer. n. 789!, Setch. in op. cit. n. 1071, Gardn. in op. cit. 

 n. 1209! Merizomyria littoralis Kuetz. Phyc. gen. pag. 232, 

 tab. 7, fig. IV, Sp. Alg. p. 325, Tab. phyc. II, pag. 13, tab. 44, 

 fig. V, SphcBrozyga Flotowiana Kuetz. Phyc. germ. pag. 172, 

 1845, Sp. Alg. pag. 290, Tab. phyc. I, pag. 51, tab. 95, fig. IV, 

 Sphoirozyga seriata Kuetz. in Bot. Zeit.1847, V, pag. 198, Sp. 

 Alg. p. 291, non WoIIe Freshw. Alg. of U. S. p. 290, t. CXCIX, 

 fig. 1, nec WoIIe in Wittr. et Nordst. exs. n. 397!, Sphcerozyga 

 variahilis Kuetz. Sp. Alg. pag. 29, 1849, Tab. phyc. I, pag. 52, 

 tab. 96, fig. IV, Suring. Observ. pag. 4B, Rab. FI. europ. Algar. 

 II, p. 192, Sphcerozyga Thwaitesii Harv. Man. pag. 233, 1819, 

 Phyc. Brit. tab. 113 b, Anabcena allantospora Mont. Explor. 

 scientif. de I' Algerie, Bot., p. 186, 1849, Syll. pag. 468, Rab. Fl. 

 eur. Alg. II, pag. 196, Sphoirozyga recta Kuetz. Phyc. gen. 

 pag. 211, Sp. Alg. p. 290, Tab. Phyc. I, pag. 52, tab. 96, fig. II, 

 Sphcerozyga allantospora Kuetz. Sp. Alg. pag. 290, Tab. phyc. I, 

 p. 51, tab. 95, fig. VI, Trichormus rectus Thw. in Ralfs On the 

 Nostoch. pag. 10, tab. I, fig. 6, Trichormus Thwaitesii Ralfs 

 On the Nostoch, in Ann. and Mag. of nat. Hist. 1850, ser. 2. 

 vol. V, p. 329, tab. VIII, fig. 4, Trichormus oscilLarioides Ralfs 

 On the Nostoch. in Ann. and Mag. of nat. Hist. 1850, ser. 2, vol. V, 

 pag. 328, tab. VIII, fig. 5 (excl. synon.), SpJicerozyga polysperma 



