266 .loiis. iiovK i>i;ri;nsi;N 



Gloeocapsa Magma Rrrb. Kutz. var. Itzigsohnii Horn.) Ilansg. 

 Hansgirj* Frodroimi.s II p. 1 17 Zopl', Spallpnaiizt'ii lal). VII, ligs. 6—9. 



E. Icel. Damp rocky-wall. Vcstdaliir lu-ar St'vt^i.slj6rr>ur */? 14. 

 Arca: Kur., .\in. 



Accortliiig to niy microscopic cxaminations I dclcrmincd the co- 

 lour ol' llie shraths to corrcspond almosl fo (".odc.x nr. iVA. (>lilor-zinc- 

 iodinc coloiiri'd in .somc cases llu> oiilcrmosl lavers of the sheaths faintly 

 violet; in other cases no colouring scenied to take place. 



Gloeocapsa alpina Nag.^ Brand eniend. 



liiand. Hol. Cenlialbl. Vol. S.l 11)00 p. 224. Lemmerniann 1910 p. 67. 



K. Icel. On more or less damp rocky walls, Fljotsdalur '^*^/6 1914. 

 Ekkjufell -/7 1914. 



Area: Eur., As., Afr., Am.. La|)pland, Alaska, Greenland. Spilzbergen, 

 Antarctic. 



A genuine aerophilous jietropliiloiis alga which often together with 

 other Cyanophyceae forms a dcep black coating on rocky walls in piaces 

 over which water is running diiring torrents of rain or diiring the thaw. 



Lagerheim has found it on snow in mountain regions. 



V. Aphanothece Niig. 



Aphanothece microscopica Niig. 



Nageli, Galtungen einz. Alg. p. 59, tab. I, fig. H. Lemmermann 1910 p. 70. 



E. Icel. Bog at an elevation of 300 m, on moss. Seyi^isfjorcVir -", « 

 1914. Former branch of Grimsa, among Myriophyllum. Vallanes. 

 temp. iA^ ■-^.; 1914. — N. Icel. Pool of water east of Skutusta(^ir, 

 temp. 21 ° '^7 1914. — S. Icel. Plancton from a small lake west of 

 Reykjavik Ve 1890 [C. H. O.)! Mud from dried-up lake bottom in a 

 "Floi" Grimsta^ir »^^/t 1905 vH- J;! 



Area: Eur., As.. Afr., Am., Austr., Færoes, Greenland. Novaya-Zenilya, 

 Lappland, Alaska. 



This species is frecjuently found in planklon, bul il is hardly any 

 genuine plankton organism. Its best habitats are rather in slngnant 

 water among mosses, Myriophyllum and the like. Has been found in 

 very cold as well as in the warmest climales and also in Al|)ine lakes 

 at extrcnicly high elevations Hi"d)el 1911 ]). 531 ; at 2306 m). Ils power 

 of adaptation seems Ihus to be very grcal if il aclually is the same 

 species which has been found in the various parts of the world. 



In somc of the above-mentioned samples I have cxaminetl llie in- 

 flucnce of chior-zinc-iodine on ils mucilaginous coating, and repeated 

 examinations have shown Ihat this does not colour. 



Aphanothece stagnina (Sprcng.i A. Br. 



Lcnmicrmaun 191U \). 71. 



A. Moorcana Harv. F.agerh. Wittr. et Nordst. Alg. exsicc. nr. 695. 



A. prnsina A. Hr in Hab, Alg. Kur. nr. 1572. 



Coccochloris slafjiiiiin S|)rengel, Linn. Sysl. vegelab. IV. 1 p. 372. (1827), 



