M^^xophyceso, Chroococcacese, Microcj^stis. 8? 



amorplio, nuinoso, pallide vel luteole rcnigineo; faniiliis sa^pe con- 

 fertis, indistincte limitatis; cellulis glol)Osis 4-0,5 [a. crassis, contentii 

 pallide cojruleoviridi. 



Hab. libere natans in lacubus, stagnis et paludibus Succiiu 

 (WiTTROCK, Lagerheim, Lemmermann) et iniprimis « Kalungen » 

 Dalia3 in Suecia (Nordstedt), in lacubus Daniae (Wesenberg-Lund), 

 in paludibus Bohemiae, Austrite (Hansgirg); in aquaeducto urbis 

 Bremae, Saxonia^ in stagnis passim, in lacu Miiggel prope Bero- 

 linum et frequenter in ceteris lacubus et fluviis Germani;Te (Lem- 

 mermann, Volk); passiin etiam in Anglia meridionali (West); in 

 lacu « Scutari » Albaniaj (Forti), in lacubus Anatolicis (Forti, 

 Brunnthaler) et Afric* tropice (Stuhlmann, Fulledorn), in lacu 

 Huro et in lacuna insuUB « Chatam » (Schauinsland). — forma 

 autumnalis Wittr. Alg. Notiser 83, p. 152 cum icone; Chromato- 

 phora parietalia. Sueciae iii lacu « Kalungen » Dali^e in superficie 

 aqu9B natans (Wittrock). — Obs.'- Cl. Zopf carotinam Micro- 

 cystidis Flos-aquce separatam in crystallis exsiccatam obtinuit; 

 hanc substantiam Polycystinam appellavit. 



5. Microcystis caeruiea Dickie On Alg. from the Amazons and its 223 

 tributaries in Journ. Linn. Soc. Bot. 1880, p. 128. — Strato 

 membranaceo, coeruleo, familiis globosis 15 [x. diametro, cellulis 

 sphciericis diam. 0,5-1,5 jx, 



Hah. in ripis irroratis tiuminis «Rio Tapaios » dicti Americ?e 

 meridionalis (Dickie). 



G. IVIicrocystis lobata Dickie On Alga; from the Amazons and its 224 

 tributaries in Journ. Linn. Soc. Bot 1880, p. 128. — Strato plus 

 minusve irregulariter lobato ; cellulis sphgericis 5 [x. crassis, con- 

 tentu la^te virescenti. 



Hah. in floribus aquie viridibus superflcie natantibus fluminis 

 « Rio Tapajos » dicti. — Ha3c forma ex descriptione a Clathr. 

 cerur/inosa non satis difTerre videtur. 



7. Microcystis stagnalis Lemmerm. in Arkiv for Bot. 1904, Bd. 2, 225 

 n. 2, p. 146, et in Plun. Ber. X, (1903), p. 150, Polijcijstis sta- 

 gnalis Lemmerm. Beitr. zur Kenntn. der Planktonalg. III, in Be- 

 richt. 3, D. Bot. Ges. Bd. XVIII, 1900, p. 24, Polycystis pallida 

 Lemmerm. Beitr. Kenntn. der Planktonalg. I, in Bot. Centralbl. 

 1898, Hft. 5-6 p, 5, nec Farl. — Strato libere natanti, valde elon- 

 gato et tenui, locis singulis expanso, excavato vel etiain reticuhite 

 perforato, ad 10-30 [jl. vel magis lato; cellulis rotundatis, 1,5-2 [x. 

 diam., vacuolis carentibus. 



