414 Myxophycese, Heterooystidese, Nostoc. 



Erb. critt. it. ser. IT, n. 530! Cesati in Erb. critt. it. n. 1326! 

 Kirchn. Algenfl. von Sciiles. p. 233, Beit. zur Algenfl. von Wiirt- 

 teraberg, 195, Ardiss. Eniim. delle Alg. di Lig. pag. 76, Born. et 

 Thur. Not. Alg. II, p. 112, Farl. Not. on the crypt. Fl. of the White 

 Mountains, p. 236, Cooke Brit. Freshw. Alg. p. 232, t. 91, fig. 12- 

 15, H. et R. Phyk. Univ. n. 89! Born. et Flah. Rev. IV, p. 210, 

 Flah. in H. et R. Phyc. Univ. n. 89! et in W. et N. Alg. exs. 

 n. 592! Hansg. Prodr. II, p. 64, Nostoc gregarium Hantzsch in 

 Rabenh. Alg. n. 1340! non Thuret. — Thallo globoso vel oblongo, 

 mediocri, rarius ultra cm. crasso, niolliori, initio vitreo, demnm 

 olivaceo vel fuscescente; filis laxe intricatis; vaginis plus minus 

 distinctis, haud raro, in gelatina hyafina, luteis; trichomatibus 5-8 

 [1. crassis, cajruleo- vel violaceo-viridibus ; articulis subglobosis; 

 heterocystis 7 [J-. crassis, subsphaericis; sporis ovaUbus, 9-15 ^ 6-7 

 [j.., olivaceis, episporio levi. 



Hab. ad muscos humidos et rupes irroratas Lapponias Lulensis 

 (Bohlin), Norvegiai (Carolina Rosenberg), Suecise (J. Agardh), 

 ScoticTe (Carmichael, West), AngiicC (West). Hibernite (Archer), 

 Galli;B (Lamy de la Chapelle, Gomont, Bornet, Flahault), Belgii 

 (De Wildeman), Helvetise (Braun, Wartmann, Brugger, Theobald) 

 et Germania' (A. Braun, Kirchner, Reinsoh), Gallia3 (Gutwinski) 

 Hungarise in fontibus S. Margarethse pr. Budam (Istvanffi), Au- 

 striae (Heufler, Beck, Stockmayer, Schiedermayr, Hansgirg, Mil- 

 DE, Kravoglj, Carinthite (Hansgirg, Schmidle), in valle fluminis 

 Han (Stockmayer), Dalmatise, Istrise, (Hansgirg), Salisburgiae 

 (Beck), Italiie Venetiis (Hauck) et prope Veronam (Forti), ad 

 Forojulium (L)el Torre), Rom;B (Martel), Indise (Hansgirg), ins. 

 Ceylonse (West); in America foederata (Farlow, Collins), dit. Ala- 

 skanse (Saunders), in nive montis Pichinchse Amer. mer. et ^E- 

 quatoriie (Lagerheim), in Fuegia (Borge), ins. Jamaica (Collins). 

 — Var. linguaeforme Hansg. Prodr. II, pag. 65: strato explanato, 

 initio spha^rico, deinde lingu;eformi, circ. 3-4 mm. lato, ad 5 cm. 

 longo, viridi-olivaceo vel luteo-brunneo. In rupibus calcareis pr. 

 <^ Krummau » Bohemite (FIansgirg). 



38. Nostoc opalinum Benn. in Journ. Roy. Micr. Soc. (1890;, pag. 9, 

 Nostoc hyalinum Benn. in Journ. R. Micr. Soc. 1886, p. 4, t. I, 

 fig. 2-3, non Roem. — Thallo libere natanti, minutissimo, gela- 

 tinoso-globoso vel leniter ellipsoideo, 210 [a. diani., lamelloso, per- 

 fecte hyalino, achroo; trichomatibus singulis in quoque involucro, 

 intricatis; articulis cllipsoideis vel globosis, viridulis, 5 [i, diam.; 



