42S Myxopliyceae, Heterocystideae, Nosto6. 



5-6 (J-. longis, 3-4 [X. latis diam, majori axi perpendiculari; epispono 

 levi brunneolo. 



Hah. in aqua fluenti, saxis adha^rens prope « Pasadena » Cali- 

 fornise Amer. bor. (Mc Clatchie), prope « Hollister » ejusdem di- 

 tionis etiam libere natans observatum est ('Setchell). 



48, Nostoc rivulare Filarszky Krypt. exs. d. K. K. Hofmus. n. 421. 

 — Thallis saspe gregariis, magnitudinis varise sed rarius usque 

 ad 1 cm. magnis, solidis, firmis, duris, gelatiuosis, globosis vel 

 subglobosis, plerumque et primum fusco-viridibus; filis f^exuoso- 

 contortis, superficiem versus dense intricatis; vaginis inconspicuis; 

 trichomatibus 3 [i. crassis; articulis sphgerico-depressis, diametro 

 brevioribus; heterocystis 4 [x. crassis, subglobosis, 



Hab. in Hungaria, lapidibus adnatum, in rivulis montanis, ra- 

 pide fiuentibus, prope « Tatrahaza » (Filarszky). — An forma N. 

 verrucosi ?. 



49. Nostoc parmelioides Kiitzing Phyc. gen. pag. 206, Phyc. germ. 

 p. 169, Sp. Alg. p. 297, Tab. phyc. H, pag. 2, t. 5, fig. H, Rab. 

 Fl. eur. Alg. H, p. 175, Alg. exs. n. 19921, Born. et Thur. Not. 

 Alg. n, p. 120, Born. et Fiah. Rev. IV, p. 219, Gomont in Bull. Soc. 

 Bot. de Fr. p. 380, Tab. IX, f. 5-8, Setch. in C. H. et S. Phyc. 

 b. Am. n. 57! Nostoc cristatum Bail. in Harv. Ner. bor. Americ. 

 III, pag. 114, Nostoc Sutherlandi Dickie in Harvey Ner. Bor. 

 Amer. III, pag. 114, Hydrococcus guadelupensis Crouan in Schr. 

 et M. Ess. de class. des Alg. de la Guad. p. 13, 1870-1877, No- 

 stoc alpinum Wood Contrib. to the Hist. of the freshw. Alg. of 

 North-Americ. p. 29, Wolle Freshw. Alg. of U. S. p. 285, t. 197, 

 fig. 33, 34 non Kiitzing nec Rabenhorst. — Thallo affixo, discoideo 

 vel linguiformi, duro, interdum subgloboso, magnitudinis variae, 

 ad 2 cm. expanso, passim a basi pullulante; filis a centro radian- 

 tibus, centralibus subrectis , paralleliter implicatis, corticalibus 

 densissime contortis, intricatis; vaginis superficiem versus lute- 

 scentibus, distinctis, intus hyalinis, soepe confiuentibus; trichoma- 

 tibus 4-4,5 |i.. crassis; articulis sphan-icis vel spha^rico-depressis, 

 arcte connexis; heterocystis 6 [x. crassis, subglobosis; sporis ova- 

 libus, 4-5 (A. latis, 7-8 [x. longis; episporio levi, luteolo. 



Hah. saxis et lignis adnatum in rivulis Galliae (Lenormand), 

 ArvernisB fGoMONT), Thuringiie (Kuetzingj, Germanife (Rabenhorst, 

 KiRCHNER), in lacubus caucasicis (Schmidle), in aquis TeneriffiTC 

 (Bory), Maderre (Kuntze), Americoe foederat;e (herb. Grunow, Har- 



