386 Myxophycese, Heterocystidese, Nostoc. 



Kuetz. Tab. Phyc. I, t. 94, f. VIII, Rab. Fl. Eur. Alg. II, p. 198 

 (fide Haiisg.), Anabama microscopica Kuetz. Tab. Phyc. L p. 51, 

 t. 94, f. IX, Spha3rozyga microscopica Menegh. in Kuetz. Sp. 

 Alg. p. 291. — Filainentis 1-1,5 [x. diam,, singulis vel pluribus 

 consociatis, apicibus leviter attenuatis; articulis subsphiericis vel 

 subquadratis ad instar monilis consociatis; contentu pallide coeru- 

 leo-viridi ; sporis articulis diam. paulo majoribus, exosporio kievi. 

 Rab. in Italia prope Messanam (BoRzi), in stagnis, iiifusio- 

 nibus, foliis et pedunculis submersis aliisve in algis epiphytica ad 

 Pragam Bohemise (Hansgirg), « Elberfeld » GermanicB (R-oyers) et 

 in montibus Pieninen Hungari;e (Filarszky); in lacu Constantise 

 (Kirchner). — Var. incrustans Grun. in Poetsch et Schiedermayr 

 Syst. Aufzahl. der im Erzherzogt. Oesterr. ob der Enns bish. beob. 

 samenl. Pfl. p. 27 (non descripta). In lacn prope «Schonthaugiitl » 

 prope Steyr (Schafp in Herb. Poetsch). 



3. Isocystis salina Iwanoff Bodor. Omsk. (Moscovite 1901) p. 7, c. ic. 

 — Trichomatibus solitariis aut paucis multisve in stratum inde- 

 finite effusum irregulariter et plus minusve dense implicatis, non- 

 nunquam paralleliter concretis, apicem versus non attenuatis; ar- 

 ticulis sphijericis, 3-4 [x. latis; sporis ignotis. 



Hab. in lacubus salsis prope «Omsk» Sibirite (Iwanoff). 



Species incertse, forsan Anabcence status sistentes. 



4. Isocystis spermosiroides Borzi in Flora 1878, n. 30, p. 408. — 

 Articulis discoideo-depressis; sporis exosporio levi prseditis. 



Hab. \n Italia (BoRzi). 



5. Isocystis moniliformis Borzl in Flora 1878 n. 30, p. 468. — Arti- 

 culis globosis; sporis exosporio levi pneditis. 



Hab. in Italia (BoRzi). 



Subfamilia HETEROGYSTIDEiE. 



Heterocystaj, saltem in individuis omnino evolutis. pnesentes. 



Tribus I. Anab^nb^. 



Filamenta evaginata vel vaginis inconspicuis, diffluentibus cir- 

 cumfusa. 



NOSTOC Vaucher [1803] Histoire des conferves d'eau douce p. 203 

 (Etym. Nostoch, sec, clarum Lyngbye nomen apud Paracelsuin 



