Myxophyceae, HeterocystiAese, Nostoc. 411 



Vaucher), Tyrolife (IIansgiru, Ungeu, Kerner, Milde, Hausman, 

 Kravogl), Daltnatiae ad Bocagnazzo (Hansgirg), Rosiiiie (Gutwinski, 

 PROTif', Beck), Bohemiie, Carinthite (Hansgirg), Poloniie (Alexen- 

 KO, Raciborski), GaliciiB (Gutwinski), Riesengebirge (Schroeder), 

 Angliiie (West, Carmichael), Hiberniae et Scotiae (West), Gallioi 

 (Bornet, Mougeot), ins. Sardinioe (Marcucci, Piccone), Italia^ (I^i- 

 COPOLI, Cesati, Balsamo, Doria, Ardissone, Martel, Meneghint, 

 Del Torre, Garbini?, Levi, Pasquale, Zanfrognini), Americ;!' 

 foederatie (Weddell, Wood, Wolle, Collins), in ditioiic Alaskaiui 

 (Saunders) et australis ad Montevideo (Arechavaleta); in fluvio 

 Sharp ins. S. Vincenti (West) et in dit. « New South Wales » Au- 

 stralisB (Sonder). — Var. molle (Ag.), N. lichenoides -( molle Kuetz. 

 Sp. Alg. p. 296, Nostoc molle Ag. Aufzahl. in Fl. 1827, X, p. 629: 

 peridermide achromatica, gelatinosa, obsoleta. Passim cum typo 



(KUETZINGj. 



31. Nostoc Austinii Wood Freshw. Alg. of the U. S. p. 27. — Strato 969 

 subgloboso, parvo, plerumque magnitudine ovorum piscium, raro 

 circ. 4 mm. diam. tequante, fuscescente vel nigre.scente, interdum 

 duro interdum submolle, superficie ssepe corrugata; filamentis va- 



rie curvatis, dense intricatis vel distantibus et laxissime intrica- 

 tis, viridibus, fuscescentibus, subplumbeis vel luteo-brunneis, in 

 thallis minoribus sa^pe distincte vaginatis, in thallis majoribus 

 vaginis diffluentibus circumfusis; articulis maturis globosis, stepe 

 didymis, crasse granulatis, 6.5-8,2 \u d. ; heterocystis articulorum 

 diametro aequalibus vel paulo majoribus, globosis, terminaUbus v. 

 intercalaribus plerumque sparsis. 



Hab. in rupibus irroratis ditionis N. J. Amer. bor. (Austin). — 

 Ut noimulhe alia' species clari Wood, hiiec etiam collectitia videtur. 



32. Nostoc minutum Desm. Crypt. de Fr., I edit., fasc. XI, n. 50 970 

 (1831) Born. et Flah. Rev. IV, p. 209, Hansg. Prodr. II, pag. 64, 

 Nostoc pedemontanitm Rab. Algen n. 175 (1852), fide Borneti 

 Nostoc BoussingauUii Mont. in C. R. des seances de PAc. des 

 Scienc. t. XLII, pag. 756 (1856). — Thallis minutis, gregariis, glo- 

 bosis, demum explanatis, membranaceis, usque ad 10 mm. latis; 

 filis dense implicatis; trichomatibus 2,5-3 \u crassis; articulis do- 

 liiformibus; heterocystis 4-5 [j.. crassis; sporis ignotis. 



Hah. ad terram humidam et vasa fictilia, in quibus plantae co- 

 luntur in diversis locis ex. gr. prope « Karlskrona » Sueci:e in 

 aquario aquiie salsoe (Gosselmann), Galliffi (Desmazieres, Monta- 

 gne), Bohemioe (Hansgirg), Austriio (Grunow), ItaliiT' superioris 



