164 Myxopliycese, Osoillatoi-iese, Oscillatoria. 



p. 160, Sp. Alg. p. 2U, Tab. Pliyc. I, p. 30, t. 42, f. IV, Cooke 

 Brit. Freshw. Alg. p. 251, t. 97, f. 5, Gom. in Journ. de Bot. IV, 

 p. 357, Rab. Fl. Eur. II, p. 107, Nordst. in W. et N. Alg. exs. 

 n. 1183! 0. limosa d amethysteo-chalybea Kuetz. Sp. p. 243, Osc. 

 nigra p Brehissomi Kuetz. Sp. Alg. p. 215 p. p., Rab. Fl. Eur. II, 

 p. 107, Moug. et Nestl. Styrp. crypt. Vog. rhen. n. 1491, 0. limosa 

 var. allochroa Moug. et Nestl. St. crypt. vog.-rhen. n. 1378, 0. 

 limosa var. chalybea Rab. Alg. exs. n. 777! 0. nigra var. nebidosa 

 Breb. in Rab. exs. n. 2177! 0. rubescens Richt. in H. et R. Phyc. 

 Univ. n. 476! — Strato nigro-chilybeo; trichomatibus livide pur- 

 pureo-chalybeis, in sicco hyalinis vel pallide cseruleis, rectis, llexi- 

 iibus, non torulosis, 6-11 [x. crassis, apice haud attenuatis subcapi- 

 tatis admodum rectis; articulis quadratis vel diametro duplo bre- 

 vioribus, 4-11 [j- longis; contentu in specim. siccis pellucido vix 

 granuloso; dissepimentis passim granulis refringentibus crassis 

 notatis; membrana cellulse apicalis superne convexa evidenter in- 

 crassata. 



Hab. aquas quietas vel fluentes Gallite (Mougeot et Nestler, 

 Brebisson, Thuret), Germani;e (Rabenhorst, Royers, Schmula ct 

 Richter), Riesengebirge (Schroederj in mont. Tatricis (Vesuskyj, 

 HelveticG (Kuetzing), Austri^B (Beck, Stockmayer), Angliae (Cooke, 

 West), Hibernise (West), Itali» ad Senas (Tassi Fl.), ad oras 

 Ligurise (Strafforello) et in solo humido prope Romam (Martel?), 

 Suecite (Nordstedt), ins. Azoricarum (Bohlin) et «Reunion» (Jadin), 

 Indite ad liombay (West), Fuegiie (Borge). — Cl. Rabeniiorst de- 

 scripsit in Flora Europa^a duas varietates, quarum una, var. bar- 

 bata, non est nisi species typica a bacteriaceis quibusdam apice 

 affecta; altera ad aliam speciem indeterminatam est pertinet. 

 30. Oscillatoria nigra Vauch. Hist. des Conf. p. 192, n. 3, t. XV, f. 4, 

 Kuetz. Phycol. gener. p. 189, n. 34, Tab. Phyc. I, t. 42 f. III, 

 Mart. Flor. Erl. p. 307, Hook. in Harv. Brit. Flor. II, p. 376, 

 Mackay Flor. Hibern. p. 239, Rab. FI. Eur. Alg. II, p. 107 p. p., 

 uec Rab. Alg. exs. u. 777! (sub 0. limosa var. chalybea) fide 

 cl. Hansg. quse 0. irrigua typica est nec n. 89, 10361 1116! nec 

 Kuetz. Alg. Dec. n. 33! qune Myxophyceis compluribus sunt adscri- 

 benda3, Lyngbya nigra (Vauch.) Hansg. Prodr. II, pag. 116. — 

 Strato plus minus compacto submembranaceo, plerumque natante, 

 chalybeo- vel obscure olivaceo-nigro I;etissime nitente; trichom;itibus 

 rectis vel levitcr llcxuosis, 8,5 [j.. diam., apice obtuso-rotundatis, 

 nudis vel attenuatis; articulis diametro lequalibus (post divisionem 



