412 Myxopliycese, Heterocystldeae, Nostoc. 



ad Vercellas (Cesati) et medise ad Senas (Fl. Tassi), Africa; cen- 

 tralis (Welwitschj, dit. « Alaska » (Saunders), Fuegia? (Borge). 



Sectio VIl. Prunipormia Born. et Flah. Rev. des Nost. IV, p. 209. — Terre- 

 stres vel aquatlcae, sphsericse, peridermide firmo. 



33. Nostoc macrosporum Menegh. Monogr. Nostocli. ital. pag. 116, 

 t. 14, f. 2, Hass. Brit. Freshw. Alg. p. 293, t. 73, f. 1-2, Rab. 

 Fl. eur. Alg. II, p. 163, Heufl. Enum. crypt. It. Ven. p. 88, Borzi 

 Morf. in N. G. B. It. 1878, vol. X, p. 283, Kirchn. Algenfl. von 

 Schles. p. 236, 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. 92, f. 1-3, Born. et Flah. Rev. IV, p. 200, Hansg. 

 Prodr. II, p. 64, Hieron. in H. et R. Phyc. Univ. n. 4461 Lagerh. 

 in W. et N. et L. Alg. exs. n. 13331 Nostoc crassisporum Menegh. 

 Consp. pag. 7 (1837) Hormosiphon macrosporics Kiitz. Sp. Alg. 

 p. 302, Tab. phyc. II, p. 4, t. 13, f. I, Briigg. Biindn. Alg. p. 261, 

 Diploco lon HeppiiHsintzsch in Rab. exs. n. 1339! (non Naegeli), iVo- 

 stoc Ichthyoon Rab. Fl. eur. Alg. H, p. 164, Nostoc pyrenaicmn 

 Rip. in Bull. de la soc. bot. de France 1868, XV, p. XXXII (fide 

 Bornetii). — Thallo minimo, solido, globoso vel oblongo, aerugineo 

 vel olivaceo, fuscescente; filis laxe intricatis, flexuoso-curvatis vel 

 spiraliter convolutis; vaginis saepe distinctis, luteis; trichomatibus 

 8-9 [1. crassis; articulis brevibus, discoideis vel diametro lequilon- 

 gis, arcte connexis; heterocystis subsphgericis, 9-10 \x. crassis; 

 sporis globosis, mutua pressione angulosis vel globoso-compressis, 

 articulis duplo triplove majoribus, episporio tenui, levissimo. 



Hah. inter muscos et Algas ad rupes irroratas Angliae (Cooke, 

 West), Galliae meridionalis (Flahault, Belloc), Helvetiae (Bruia- 

 GER, Hauck), Germanife (IIantzsch, Kirchner, M. Schmidt, Lem- 

 mermann), Hungaria? (Istvanpfi), RossiiB pr. Cingujev (Riabinine), 

 Austrife (Hauck, Beck, Schiedermayr, Hansgirg), Italiae superioris 

 (Meneghini, Zanfrognini, Mach) et Rossioe pr. Romam (Martel), 

 TyroIia3, Dalmatite, Istriie, Riesengebirge (Hieronymus), Carinthire 

 (Hansgirg), Americ^e foederatae (Wolle, Farlow), .Equatorine (La- 

 gerheim), ins. Mariann. (Gaudichaud). 



34. Nostoc minutissimum Kuetz. Phyc. gener. pag. 204, Tab. Phyc. 

 II, Tab. I, l' 1, Sp. Alg. (1849) pag. 204, Rab. Fl. Eur. Alg. II, 

 pag. 162, Richt. in Rab. Alg. exs. n. 2245! Nostoc minutissimum 

 a genuinum Kirchn. Alg. v. Schles. pag. 232. — Strato minimo, 



