•4 Myxopliycese, Heterocystidege, Nostoc. 



Prodr. II, pag. 58, D. Torre et Sarntli. Alg. v. Tyr. Vorarlb. u. 

 Liecht. p. 134 (non Suringar), Mc Clatch. in C. H. et S. Phyc. bor. 

 Amer. n. 355, D."' Butl. et Poll. in C. H. et Seteh. Phyc. bor. Am. 

 n. 1111! Nostoc lacustre Kuetz. Phyc. Gen. p. 208, Phyc. germ. 

 p. 170, Sp. alg. p. 300, Tab. Phyc. H, p. 4, t. 11, f. II, Rab. 

 Deutschl. Kryptogamenfl. p. 65, Kryptogamenfl. voii Sachs. p. 97, 

 Fl. Eur. Alg. II p. 179, Bulnh. iri Rab. Alg. exs. n. 310, Heufl. 

 Enum. crypt. It. Ven. p. 88, Kirclin. Algenfl. von Schles. p. 235, 

 Die mil<:roskop. Pflanzenwelt. p. 40, Hnnsg. Neue Beit. zur Algenlc. 

 Bohm. p. 7, Wille Bidrag till Sydamer. Algfl. in Bih. till Kongl. 

 Svensk Vetensk. xAkad. VIII, p. 28 (?), Nostoc inundatum Kuetz. 

 Phyc. gen. p. 207, 1843, p. p. non Rabenhorst, Nostoc agglutinans 

 Menegh. Kuetz. Sp. Alg. p. 300, 1849, Tab. Phyc. II, p. 3, t. 10, 

 f. I, Rab. Fl. Eur. Alg. 11, p. 178, Hilse in Rab. Alg. exs. n. 14641 

 Heufler Enumeratio cryptogam. Italiie Venette, p. 88, Kirchn. Al- 

 genfl. V. Schles. pag. 234, Nostoc coinmune [3 fuscum Hilse in 

 Rab. Alg. exs. n. 1032! nec alibi, Nostoc rufescens b wruginea 

 Rab. FI. Eur. Alg. II, p. 279, Reinsch Algenfl. von Frank. p. 46. — 

 Thallo initio globoso, Isete ajrugineo, demum bulloso et varie tu- 

 berculato, mucoso v. gelatinoso, ferugineo-fuscescente; filis flexuo- 

 sis, modice intricatis; vaginis ad superficiem thalli distinctis, fu- 

 scis, intus confluentibus, hyalinis; trichomatibus 4 [j.. Iat.,dilute oli- 

 vaceis; articulis sphcerico-depressis vel diam. usque duplo longiori- 

 bus; heterocystis subspha^ricis vel oblongis, 4,5-6 [x. latis; sporis 

 globosis, 6-7 [A. crassis, in longas catenas seriatis, approximatis, 

 episporio levi, hyalino, cum vagina concreto. 



Hah. libere natans in fossis et stagnis Italiae prope Romam 

 (Martel), Gallice (Brebisson), Franconiie (Reinsch), Germanice 

 (KuETZiNG, KiRCHNER, M. ScHMiDT, Lemmermann), Galiciie (GUT- 

 wiNSKi), Bosniffi (Protic), Bohemia3 (Hansgirg), Polonite (Racibor- 

 SKi, GuTWiNSKi), Rossiae (Riabinine, Dorofieff), SueciLB ad Upsa- 

 liam (WiTTROCKj et in lacubus prope Holmiaui (Trybom), Austriie 

 prope Leonstein (Schiedermayr) et Vindobonam (Zukal), prope 

 Bozen (Heufler), HoIIandia; (Suringar), Anglia^ (Cooke, Westj, 

 Groenlandiie (Richter), India^ orientalis (Hansgirg); in ditione Ca- 

 lifornica (Mc Clatchie) et Canadensi (D.-*^ Butler et Polley); in 

 Brasilia (Lofgren) et prope «Montevideo» in Republica Urugua- 

 yensi (Wille). — [Var. builosum Kuetz. Sp. Alg. p. 300, Nostoc 

 Rothii Ag. Syst. pag. 120 (excl. cet. syn.). In lacubus et stagnis 



