Myxophyceas, Heterocystideae, Anabaena. 463 



Cylindrospermuin polyspermum Marsson in Rab. Algen n. 531 ! 

 (fide Borneti), Cylindrospermum flexuosum Rab. Alg. exs. n. 12541 

 Fl. Europ. Algar. H, p. 188, Kirchn. Algenfl. v. Schles. p. 237, 

 Wolle Freshw. Alg. of the U. S. p. 292, t. CXCIX, f. 13, Sphce- 

 rozyga gelatinosa Reinsch in Rab. Alg. n. 19131 et 2156! (fide 

 Borneti), Anabwna Ralfsii Cooke Brit. Freshw. Alg. pag. 237, 

 tab. 94, fig. 1, Hansg. Prodr. II, pag. 70, Nostoc spongiceforme 

 Tild. Amer. Alg. n. 83 (sententia Setchelli). — Strato gelatinoso, 

 atro-viridi; trichomatibus 4,2-G [j.. crassis, articulo extremo rotun- 

 dato; articulis doliiformibus, diametro aequilongis, paulo breviori- 

 bus vel longioribus; heterocystis sphoericis, 6-8 \i.. crassis vel ovoi- 

 deis, 6 [1. crassis, in proximitate sporarum usque ad 10 [j-. longis; 

 sporis junioribus ovoideis, demum cylindraceis, solitariis vel bi- 

 triseriatis, apicibus rotundatis, heterocystye contiguis, evolutione 

 centripeta, 20-40 ^ 8-10 ji.., episporio levi, in sporis maturis pal- 

 lidissime fuligineo. 



Hah. in stagnis, paludibus et fossis Suecice (Nordstedt), Daniae 

 (LiEBMAN, Lyngbye, Hofman-Bang, Rosenvinge, Mortensen, J. 

 Schmidt), Anglia? (West), Neerlandiae (Van der Bosch), Italise ad 

 Utinum (Comelli), in Benaco (Garbini) et pr. Romam (Martel), 

 Galliae (Bornet, Gomont), Belgii (Bory), Germaniae (Kuetzing, 

 Al. Braun, Kirchner, Schroeder etc), ins. Wangenrooge (Lem- 

 mermann), Helvetiae (Rabenhorst), BohemiiE, Carinthise, Austriae, 

 Istri;ie, Dalmatiie ( Hansgirg, Zukal, Schiedermayr), Tyrolise 

 (Hansgirg, Dalla Torre, Sarnthein), Galicise (Gutwinski), Pol- 

 tawie (Alexenko), lacus Balaton et passim in Hungaria (Ist- 

 VANFFi), Fenniae (Elfving), Rossiae (Iwanoff); in Babia Gora 

 (GuTwiNSKi) et Terra «Ordos» Mongoliae (Istvanffi); in ins. 

 «Falkland» (J. D. Hooker); ad « Glenorchi » Novae Selandiae 

 (Schauinsland) ; in Cladophoris stagnorum Patagoniae (Spe- 

 GAZziNi) et in flumine « Purus » Amazoniae (Dickie), in Fuegia 

 (Hariot), Brasilia (Schmidle), .Equatoria (Lagerheim), America 

 boreali (Wood, Wolle, Bessey, Tilden) ; in thermis Italiae in mon- 

 tibus Euganeis (Meneghini) et Germaniae (Agardh). — Var. 

 elongata (Kuetz.) Born. et Flah. Rev. IV, p. 236, Cylindrospermum 

 elongatam Kuetz. Sp. Alg. p. 294, Tab. phyc. I, pag. 53, t. 99, 

 fig. III, Rab. Alg. exs. n. 3151 Schliephacke in Rab. exs. n. 17031 

 Sphwrozyga elastica Ralfs On the Nostochinea^ p. 332, t. VIII, 

 f. 9, Cooke British Freshw. Algte p. 242, t. 94, f. 7, Spha^rozyga 

 elongata (Kuetz.) Crouaa FI. du Finist. p. 111, Sphccrozyga le- 



