968 



MyxopliyceaB, Heterocystidese, Nostoc. 409 



iiiitiutissiinis et nunicrosis farctis, eplsporio levi. — Iri Sicilia ad 

 Messanani (Borzi). — Pnieeunte Auctore ipso, h;ec species eadeni 

 ac N. margaritaceum Ral). (= N. commune) videtur. 



28. Nostoc botryosum Rabenli. V\. Eur. Alg, II, pag. 174, Alg. exs. 967 

 n. 15! — Strato saturate olivaceo-atro, elastico, tuberculoso, e 

 basi stipitiformi globoso, usque 1 cm. diani. tequante, aggregato 



et basi connato, peridermate firmo, coriaceo, olivaceo vel fusco- 

 scente; trichoinatibus leviter curvatis, dense complicatis (filis sub- 

 tilissimis, hyalinis, achrois passim intermixtis); articulis globosis 

 vel globoso-compressis, arcte vel laxius connexis, 8,5-5 [x. crassis; 

 heterocystis articulorum dianietro paulo majoribns, interjectis ter- 

 minalibusque. 



Hab. in rupibus in Rheno prope Laufenburg (E. Stizenbergj. 



29. Nostoc calidarium Wood Freshw. Alg. of U. S. p. 34, t. II, f. 2, 

 Journ. of Sc. and Arts 1869. — Strato raaximo, indefinite expanso 

 aut membranaceo coriaceo vel membranaceo-gelineo vel meinbrana- 

 ceo aut laete viridi vel sordide olivaceo viridi vel olivaceo brunneo, 

 irregulariter profunde laciniato-sinuato, demum ele.uanter laciniato; 

 trichomatibus ina^qualibus, fiexuoso-curvatis, plerumque subrectis 

 ot arcte conjunctis, in formis duabus occurrentibus ; forma altera 

 parva, viridi; articulis cylindricis, heterocystis interjectis, vaginis 

 interdum obsoletis, spepius dilfluentibus; forma altera maxima ar- 

 ticulis globosis vel oblongis, aiirantiaco-brunnea, heterocystis a ce- 

 teris cellulis haud diversis. 



Hah. <v Benton Springs » Owen Valley, California Amer. bor. 

 (Partz.). — Obs. Cuni N. communi Vauch. comparanda species, 

 nisi collectitia. 



30. Nostoc sphaericum Vaucher Hist. des Conf. p. 223, t. XVI, f. 2, 

 Lamarck et D. C. FI. Fr. II, p. 4, Ag. Synops. p. 133, Syst. p. 20, 

 Lyngbye Hydrophyt. p. 200, Desm. Crypt. de Fr. I serie, n. 52! 

 Harv. in Hook. Brit. Fl. II, pars I, p. 400, Man. p. 185, Wallr. 

 Fl. crypt. Germ. p. 30, Breb. et God. Alg. de Falaise, p. 37, 

 Welwitsch Synops. Nostoch. Austr. infer. pag. 17, Hass. Brit. 

 Freshw. Alg. p. 289, t. 76, f. 5, Roem. Alg. Deutschl. p. 46, f. 183, 

 Rab. Kryptog. v. Sachs. p. 96, Bulnh. in Rab. Alg. exs. n. 746!, 

 Suring. Obs. phyc. in fl. Bat. p. 42, Ardiss. Enuni. Alg. Sic. p. 400, 

 Enum. delle Alghe della marca di Ancona p. 18, Enum. alg. della 

 Liguria p. 76, in Erb. Critt. ital. s. II, n. 564!, Crouan Fl. du 

 Finist. p. 111, Reinsch Algenfl. von Franken, p. 46, Heufl. Enum. 

 cryptog. It. Ven. p. 88, Wood Contrib. to the Hist. of the Freshw. 



