274 .ions. HoM: i'i ri:Msi;.\ 



Oscillatoria limosa Aj^. 



Gonionl. Mono««!-. II p. 210. |)l, VI, liJ,^ 13. 



N. Iccl. Ski'itii.stai^ir. small pool in wliitli a sprin«^ llows out. Icmii|i. 

 T" ^V; 1914.— \V. ici'l Hvtravollir. lemp. 19 "^ C. Wesl 1902 p. 245). 

 — .S. Iccl. piiif^vi'llir. In Nicolasarj^ja on rocks. lemp. 3'/-' ° '^/'8 1914. 

 Apavatn. strcam willi lainl currcnl, lemp. 1 "^ ^^ s 1914. Lauf^arvaln, 

 s|)riii}4 at the eclgc of Ihe sliore, lemp. 12** ^^/s 1914. (Notice, Ihe lemp. 

 of tlic lake at hardly 1 in. distance 18".) 



.\rca: l'bitpiist. Sj)itzbcrgcn, Lappland, Færoes, Greenland. 



Tilis widely ranj^inj^ and common s])ecics is chiclly i'ound in fresh 

 water. whetlicr staj^nanl or ninning. Fre(|ucntly it has. Iiowcver, been 

 mel with on moist carth and in brackish water. West (1. c.i opines 

 havinj^ found Ihis species in a hot spring (49 "), but this is unicpie. Tilden 

 only (1910 p. (56; nientions that it is found in Iowa "in a sulphur spring". 

 What is mcant by a sulphur spring 1 cannot conceive, and no tempe- 

 rature is given. In Kolkwilz and Marsson Ihe species is placed as 

 /^-mesosa|)robe. 



All the localities in Iceland. where I myself have found it, are identical 

 in that they all occur at the outlet ol' cold sjirings where conseciucntly 



the temperature is low. 



• 



Oscillatoria curviceps Ag. 



Gomont, Monogr. II j). 213. |)1. VI. fig. 14. 



E. Icel. Vallanes ^s/^ 1594 h. J.)! - S. Iccl. EyiM.stjorn near 

 Reykjavik ^'r. 1896 (C. H. O.)! 



Area: luir.. Am., Antarctic, Færoes. Greenland. 



Seems to thrivc bcst in quiet water. hencc often in ditchcs and 

 thickets ot reed along lake-margins. 



Oscillatoria anguina Bory. 



Gomont, Monogr. Il j). 214, pi. VI, fig. 16. 



N. \V. Icel. Hotn in Geirhjofsfjon'^ur, lake, lemp. 10" "'^,7 1915 (H. J.)! 

 Area: E)ur., Air., Am. 



This easily recognizable species has not been found very oftcn and 

 always under highly varying exlernal conditions. It is mentioned as terrc- 

 strial Esmarcli 1914 p. 2(iij , is found in hot s|)rings and in stagnanl as 

 well as running water. In the Icclandic sample, consisling of mud from 

 the boltom of a small lake. it occurs but sparingly. 



Oscillatoria irrigua Kutz. 



(iomonl. .Monogr. II |). 218. i)l. VI, ligs.'22 23. 



S. Icel. Strcandet near .\pavatn. current nol strong. tcmp. 4*' 

 ^Vs 1914. 



Area: Kur., As., Afr., Austr.. .\ntarctic, Spilzbcrgen. 



Strange to say this species has not yet been found in America. It 

 occurs in stagnant as well as in running water and on moist rocks too. 



