4ir0 Myxophyceae, Heterocystidese, Aphanizomenon. 



noniam (BoRzt), Mantuam (Garbini), Neapolim (De Gasparis) et 

 Forojulium (Del Torre), prope Veronam et in Benaco (Forti), A- 

 natolise in lacu « Apollonia» (Brunnthaler), Indiae (Turner), Amer. 

 foederata3 (Wolle, Farlow, Nelson, Tilden) necnon in glacie prope 

 Berolinum (P. Magnus). — Var. gracilis Lemm. in Beitr. z. Kenntn. 

 d. Planktonalg. VI, in Ber. d. Deutsch. Bot. Ges. 1900, Bd. XVIII, 

 Hft. 3, p. 96, Ploener Forschungsber. 1898, p. 180: trichomatibus 

 in fasciculos raro consociatis; articulis 2-3 [x crassis, 2-6 rarius 

 usque ad 25 [i. longis; heterocystis 3 [j.. latis, 5,5-7 \).. longis; 

 sporis cylindricis, s;epe medio paulo constrictis, 4,5-5,5 [a. crassis, 

 22-30 [j.. longis; vacuolis aerogenis compluribus. — In « Vaterne- 

 verstorfer Binnensee > Holsatite et in Borringesjon (Lemmermann) 

 et in Valloxensee Sueciie (Borge). — Var. hercynica Kuetz. Sp. 

 Alg. p. 286: laminulis c;cruleo-;:erugineis, hmceohitis aut ovato-hm- 

 ceolatis, brevioribus 1-2 mm. longis '/, mm. latis; trichomatibus 

 crassis, flaccidis, subfragilibus, evidenter articulatis; articulis dia- 

 metro subfequalibus aut brevioribus, lucido-granulatis; sporis 37- 

 75 [JL. longis, 4,5-5 \i. crassis, cylindricis, — In stagno Hercyniae 

 (Romer). 



2. Aphanlzomenon incurvum Morr. Mem. de IWcad. roy. de sc. et bell. 

 lett. de Brux. 1838, XI, pag. 11, Born. et Flah. Rev. des Nostoc. 

 het. III, p. 242, De Wild. Alg. de Belg. p. 460. — Lamella plana, 

 albo-viridi, incurva, filis coadnatis, articuhs 2-8-duplo longioribus, 

 discretis, c;eruleo-viridibus. 



Hab. in fossis et stagnis aquse dulcis in Flandria, m. majo ad 

 julium (Morren). — Suadente cl. Richter (Hedwigia 1896, p. 269) 

 ha:'c species ;i pnecedenti haud diftert. 



3. Aphanizomenon holsaticum P. Richter in Hauck et Richter Phyk. 

 univ. n. 746! Hedwigia 1896, n. 5, p. 273 — Laminulis natanti- 

 bus, sigmoideis, rectis et curvatis; trlchjmatibus strictis, elasticls, 

 gequallbus, 7-8 [x. longis vel ad apicem sensim attenuatis; articulis 

 granulosis 6-8 (apice 3) [j,. diam., ;id genicula hinc inde leviter con- 

 strictls; sporls cylindricis, 35-60 *^ 9-12 [i., elongatis, polis obtusis 

 diametro artlculorum cTequallbus 5-7plo longloribus, aetate provecta 

 medio modice tumldis, granulis refringentlorlbus repletls; episporio 

 levi, hyalino, dlstincto; heterocystis Ignotis. 



Hab. in piscina ad « Oldesloe » Germania? (Sonder). 



