Myxophycese, Ileterocystidese, Anabaena. 465 



Obs. Cl. Schinidle (Zur Etitwickelung von 5'. oscillariokles (Bory) 

 Kuetz.) adfirmat speciem hanc evolutionis stadiuui A. oscillarioi- 

 dis Kuetz. sistere. 



33. Anabaena Thwaltesii (Ralfs) Cooke Brit. Freshw. Alg. pag. 238, 1045 

 tab. XCIII, fig. 5, Dolichospermu7n 7%M'ate^V Ralfs Ann. of Nat. 

 Hist. 1850, p. 337, t. 9, f. 5. — Trichomatibus nioniliformibus, rectis 



vel subrectis; articulis quadratis, 6-7 |x. diam.; heterocystis oblon- 

 gis, subquadratis, 8-10 [x. diam., articulos diametro excedentibus; 

 sporis numerosis, cylindricis, apicibus truucatis, 10-12 [i. crassis, 

 longitudine 25-30 ji. 



Hab. in scrobiculis aquie dulcis et subsalsaB Angliae (Ralfs, 

 Cooke) et Lapponice Lulensis (K. Bohlin). 



34. Anabaena cylindrica Lemm. in II. Beitr. z. Algenfl. der Plun. 104G 

 Seengeb. in Ploner Ber. IV (1896) p. 186-7 c. ic. — Strato geli- 

 neo, laete aerugineo, plantis aquaticis adhasrenti vel libere natanti; 



filis plerumque rectis, parallelis v. subparallelis; artieulis elongatis, 

 subcylindricis, 3-1 [i. latis, 3-6 {i. longis; articuli apicalibus ro- 

 tundatis, contentu vacuolis carente; heterocystis 6-8 « 5 (x., sub- 

 globosis oblongis vel subcylindrico-rotundatis, involucro subcylin- 

 drico, angulato, hyalino circumdatis; sporis valde elongato-cylin- 

 dricis, heterocystis utrinque contiguis, siepe 2-4-seriatis, 5 \l. diam. 

 usque ad 6-plo longioribus; episporio levi hyalino. 



Hab. in Charis in lacu « Ausgrabensee > Holsatise (Lemmer- 

 mann). — Var. marchica Lemm. in Hedwigia Bd. XLII (^1903) 

 pag. 168: articulis longioribus, usque ad 7 [x. longis; heterocystis 

 subcylindricis nec involucratis, 8-11 « 5,5 [jl.; sporis etiam subcj'Iin- 

 dricis, plerumque solitariis, 21-28 ==? 7-8 [i. 



35. Anabaena toruiosa (Carmich) Lagerheim Birlr. till Sver. Algfl. in 1047 

 (Efv. afK. Vet.-Akad. Forh. 1883, p. 47, CoII. In herb. ! et in C. 



H. et S. Phyc. bor. Amer. n. 354! Belonia torulosa Carm. ex 

 Harv. in Hook. Bnt. FI. 11, p. 379, 1833, Harv. Man. of Brit. Alg. 

 pag. 167, Nostoc giganteum Mohr Schleswig-Holsteinische Algae 

 aquaticie, in Schrader"s Neues Journal fiir die Botanik 1806, pars 

 III, p. 196, Anabcena marina Breb. in Menegh. Art. Anabaina, in 

 Diz. di Convers. (1839) p. 1051, Ralfs On the Nostochincc^ p. 331, 

 Kuetz. Sp. Alg. p. 287, Tab. phyc. I, p. 50, t. 92, f. IH, Rab. Fl. 

 eur. Alg. II, pag. 197, Schizonema gelatinosum Suhr Beitr. zur 

 Algenkunde in Flora XXII, 1839, p. 75, t. IV, f. 48, Sphcerozyga 

 compacta Kuetz. Phyc. gen. p. 211, Sp. Alg. p. 290, Tab. phyc. I, 

 pag. 254, tab. 95, fig. VII, Roem. Alg. Deutschl. pag. 42, f. 166, 



