442 Myxophycese, Heterocystideee, Anabsena. 



tab. 68, 1819, Agardh Syst. p. 23, Spreng. Syst. Veg. IV, p. I, 

 p. 372, Schwabe Fl. Anhalt. II, pag. 133, Bias. Relaz. del viag- 

 gio del re Fed. Aug. iii Istria ecc. pag. 252, Byssus Flos-aqwv 

 Treviranus in Linnasa 1843, vol. XVII, p. 51, tab. IIT, fig. 5-7, 

 SplicBrodesmus Spirillum Cda. Alni. de Carlsb. 1835, pag. 211, 

 t. 6, Sphmrozyga Spirillum Cda. loc. cit. 1836, p. 218, Anabcrna 

 Spirillum Menegh. in Dizion. di Conversazione pag. 1031 (Jide 

 Hansgirgj, Trichormus incun^us Allmann New Gea. of Alg;e 

 in Ann. and Mag. of Nat. Hist. ser. I, (1843), XI, pag. 461, 

 tib. V, Hass. Brit. fr. Alg. tab. LXXV, f. 1, Breb in Rab. Alg. 

 exs. n. 1368! Trichormus Flos-aquce Ralfs On the Nostochinea^ 

 p. 7, t. I, fig. 2, Cijlindrospermuni circinale Rab. Algen n. 390 ! 

 (1854) 2066 et 2066 &.^ Deutschlands Kryptogamenflora pag. 68, 

 Krypt. von Sachs. p. 99, Roem. Alg. Deutschl. p. 41, f. 162 (non 

 Kuetzing), Anabcena circinalis Hilse in Rab. Alg. exs. n. 1674! 

 Kiihn in Rab. Alg. exs. n. 2064! nec Alior. — Thallo spumoso, geia- 

 tinoso, secedenti, lubrico, natante, cseruleo; trichomatibus circinatis, 

 4-8, sDepius circiter 5,5 \).. crassis, evaginatis; articulis sphaerico- 

 compressis, diametro a?qualibus vel paulo longioribus, 6-8 {x. lon- 

 gis; heterocystis articulis paulo crassioribus et longioribus; sporis 

 curvatis, obliquis, ina^quihiteralibus, 7-13 [j.., siepius 9 [x. crassis, 

 20-35, interdum usque ad 50 [j.. longis, heterocystis proximis, 

 rarius ab eis remotis , episporio levi hyalino vel luteolo, tegu- 

 mento gelatinoso ampliato haud infrequenter cinctis. 



Hab. in lacubus et stagnis Sueci;e et pnecipue libere natans 

 (Agardh, Nordstedt, Lagerheim, Borge, De Toni et Forti), Dani;e 

 (Lyngbye, Hofman-Bang, Hornemann, Rosenvinge, Schmidt, 0- 

 stenfeld etc), Scotite (Dickie), Angii:e (Ralfs, Cooke, Bennett, 

 West etc), Franconiae (Reinsch), Galliie (Brebisson, Lloyd, Mou- 

 GEOT, BoRNET, Flahault, Gomont etc), Helveti;ie (Heuscher, Forel, 

 Schroeter, Kirchner, Chodat, Bachmann, Amberg, Waldvogel, 

 Lozeron, Forti etc), Germani;o (Kuetzing, Rabenhorst, A. Braun, 

 Reinsch, Richter, Lemmermann, Apstein, Schroder, Schorler, 

 Lakowitz, etc), Italia; (Kuetzing, Meneghini, Del Torre, Mar- 

 tel, Kirchner, Garbini, Forti etc), Bosni;e (Gutwinski, Protii;, 

 Karlinski), Tyroliae (Hansgirg), Austria^ (Beck, Zukal, Brunntha- 

 ler, v. Keissler, Brehm et Zederbauer etc), Bohemiae (Hansgirg, 

 Gutwinski), Galici;e (Gutwinski), PoIoni;ie (Racirorski, Kozlowski) 

 et Poltawa (Alexenkoj; ad Cingujew (Riabinine), in flumine Wolga 

 (Zykoff;, ad Moscowiam Rossiie (Iwanoffj; in lacubus «Tabiz- 



