Myxophycese, Scytonemacese, Plectonema, 491 



Kuetz. Sp. Alg. p. 312, Tab. Pliyc. II, p. 8, t 30, f. 4, Breb. 

 in Desm. Crypt. de Fr. Ed. I, n. 135 (fide Gom.), Moug. et Nestl. 

 Stirp. Vog. rhen. n. 13G9 (fide Gom.), Rab. Fl. Eur. Alg. II, p. 272, 

 Bcytonema allochroimi Kern. in Rab. exs. n. 1844, Plectonema 

 miixibile Thur. Essai in Ann. des Sc. Nat. I, pag. 379, Born. et 

 Thur. Not. Alg. II, p. 135, t. 33, Wolle in Rab. Alg. n. 2493! in 

 W. et N. Alg. exs. n. 391 ! et in Freshw. Alg. of U. S. pag. 266, 

 tab. CLXXXI, fig. 12-15, Hauclc in W. et N. exs. n. 586! 770«! 

 Flahault in W. et N. exs. n. 770 &! Cooke Brit. Freshw. Alg. p. 263, 

 t. CIV, f. 1 (nec Kirchn. Algenfl. von Schles. p. 229), Scytonema 

 Naegelii (Kuetz.) Wood Contrib. Freshw. Alg. of U. S. pag. 59, 

 tab. 6, f. 8. — Ca:;spitibus pius minusve expansis, fnsco-viridibus 

 aut rare obscure lerugineis, ad cm. 2 altis; filis intricatis, flexilibus, 

 vulgo flexuosis, pseudoramosis; pseudoramis sa^pe geminatis etiam 

 fasciculatis, erecto-patentibus aut oblique erumpentibus; vaginis 

 initio tenuibus hyalinis, mox luteo-fuscis, lamellosis, ad 3 [i. crassis, 

 chlorozyncico jodurato caerulescentibus ; trichomatibus aeruginosis, 

 ad genicula constrictis, 11-12 jx. crassis; articulis diam. trichomatis 

 2-6-pIo brevioribus, 3-9 [x. longis, contentu grosse granuloso sae- 

 pius farctis; dissepimentis interdum granulatis, cellula apicali ro- 

 tundata. 



Hah. plantis muscisve submersis adfixum, rarius libere natans, 

 in Benaco (Garbini), in Italia in «Cascata delle Marmore» (Martel), 

 Hispania (M. Lewin), Lusitania (Newton), Gallia (Gomont, Rous- 

 SEL, Brebisson, Durieu, Flahault), Anglia (Gray, Harvey, Has- 

 SALL, CooKE, Abbott, West), Istria (Kuetzing, Hauck), Austria 

 (Morl, Hansgirg), Bosnia, Dalmatia (Hansgirg) et Carinthia ad 

 Langenbach (Wittrock et Nordstedt), Poltawa (Alexenko), Ty- 

 rolia (Kerner, Hansgirg, Dalla Torre), Hungaria (Kalchbren- 

 ner, Istwanefi), Silesia, Virtembergia et Helvetia in lacu Con- 

 stantia; (Kirchner), America foederata (Wood, Wolle, Farlow), 

 Asia centrali, in planitie Thibetana (Holderer, Schmidle), India 

 orient. (Turner), ins. Tahiti (Frauenfeld), ins. Chatham oceani 

 Pacifici (Schauinsland) et ins. Mauritii (Dickie). — Var. gracile 

 Hansg. in Sitzungsber. d. Konigl. Ak. der Wissenschaft. in Bohmen 

 1891, p. 338: filamentis vaginis 9-12, rarius ad 15 [x. crassis, 

 pseudoramulis singulis vel geminis s?epe quasi verticaliter erectis. 

 — In rivulo montano prope « Castelnuovo » et«Gruda» Dalmatise 

 (Hansgirg). — Var. cincitinatum Hansg. Prodr. II, p. 40: strato 

 plerumque violaceo-nigro; filamentis, vaginis inclusis, usque 30 ji. 



