528 Myxopliycese, Scytonemaceae, Scytonema. 



ctis, apice subclavatis; vaginis levigatis, non undulatis. In iisdem 

 cum antecedente locis, ssepe in consortio Scytoneinatis fonnarum 

 variarum, prope St, Aubin (Braun); ad « Hinterlvaiser» et prope 

 «Kufstein» (Heufler). 



50. Scytonema alatum (Carm.) Borzi Morf. e biol. delle Alghe ficocro- 

 macee, in N. Giorn. Bot. ital. XI, p. 373 (1879), Born. et Thur. 

 Not. Alg. p. 152, Born. et Flah. Rev. des Nostoc. het. III, p. 110, 

 Flah. in W. et N. Alg. exs. n. 880! Lag. in W. N. et Lag. Alg. 

 exs. n. 13151 Oscillaria alata Carm. in Grev. Sc. Crypt. Fl. IV, 

 p. 40, t. 222 (1826!) Petalonema alatuin Berk. Glean. of Brit. 

 Alg. p. 23, t. 7, f. II (1833), Hass. Brit. Freshw. Alg. p. 238, Harv. 

 Ner. Bor. Am. III, p. 99, t. 48 A, Cooke Brit. Freshw. Alg. p. 267, 

 t. 107, f. I, Wolle Freshw. Alg. of U. S. p. 267, t. CLXXXVIH, 

 f. 15-16, Scytonema crustaceum Ag. var. alatiim (Berk.) Hansg. 

 Prodr. II, pah. 32, Arthrosiphon Grevillei Kuetz. Phyc. germ. 

 p. 177, in Bot. Zeit. V, pag. 197, Sp. Alg. p. 311, Tab. Phyc. II, 

 p. 8, t. 28, f. I, Fischer Beitr. zur. Kenntn. der Nostoc. pag. 21^ 

 et f. X, Briigg. Biindn. Alg. p. 265, Cramer in Rab. Alg. exs. n. 553 ! 

 Wartm. in n. 1098! et Hepp in n. 17091 Arthrosiphon alatus 

 Rab. FI, Eur. Alg. II, pag. 265, Arthrosiphon densus Beccari in 

 Erb. critt. it. ser. II, n. 1521! tide Borneti non Kuetzing, Arthro- 

 siphon alatus var. plicatulus Breb. in Rab. Algen, n. 2183! — 

 Strato ca.'spitoso, mucoso, nigro-fuscescente, filis fiexuosis, erectis 

 vel adpressis, 4-8 raillim. longis, 24-66 [x. crassis; pseudoramis 

 brevibus, patentibus, ambitu irregulari; vaginis multipliciter la- 

 mellosis, ochreatis; laniellis maxime dilatatis, stratis internis luteo- 

 fuscis ad heterocystas exterioribus hyalinis, superficie kevissimis ; 

 trichomatibus serugineo-viridibus ; articulis 9-15 [x. crassis, dia- 

 metro brevioribus; heterocystis fuscis, globosis. 



Hab. ad rupes aqua dulci semper irroratas, sub molendinis et 

 cataractis, necnon in paludibus inundatis, aliis speciebus Scepius 

 immixtum, per Angliam (Carmichael, Bbrkeley, Cooke, West), 

 Hiberniam (West), Galliam occidentalem et meridionalem (Bornet, 

 Flahault), Helvetiam (Al. Braun, Wartmann, Harz, Killias, 

 Hepp, Cramer, Schinz), Austriam (Stockmayer, von Morl), Bohe- 

 miam (Hansgirg), Italiam (Beccari, Meneghini, De Toni, Forti), 

 Tyroliam (Hansgirg, Dalla Torre), Carinthiam (Hansgirg), 

 Bosniam (Protk;), Germaniam (Kuetzing), Americam fiederatam 

 (Wolle, Jone), etiam in cataractis Niagarae (Wood), .Equatoriam 

 (Lagerheim). — Var. nodosum Kuetz. Sp. Alg. p. 311, Rab. FI. 



