'MO .ions. Movi-: iM;ri:M.sEN 



-^ 19.8" wilhout dyin}^, mul lliat it also iu:iy l)c f:i|);il)lc of thrivinj^ al 

 ordiiKiry rooiii temperature. 



.My observations rej^ardiii'^ its occiirieiue in Iceland are in perfect 

 aceordance witli tiie ahove. in tliat I Ibiind it j^rowinj^ in water of up 

 to 55'' C. If thc temperature of tlie water exceeded tiiis, the alj^æ grcw 

 but al liie marj^in ol" tlu' sjjriuf^s where tiie lemp. was lower. I have 

 not been able to |)rove any conneclion between the temp. and the form 

 under which tlu' al<^a occurs. I presumc tiie i'orms to be deYelo|)menlal 

 sta<»es, f. phunuidioidcs l)ein{» the younj^est, 1". typica thc oldest form, but 

 in case tlie eonditions are unl'avouraljle for its <^ro\vth is remains pre- 

 sumably at ils first staj^e of developmcnt. 



Hapalosiphon intricatus W. and (1. S. West. 



.lourn. l.inn. Soc. vol. \X.\ p. 271. pi. XV, ligs. IG 28. 



N. leel. Ski'iluslaciir, small pond, on parts of old piants. temp. 

 IG" 1^/7 1914. 



Area: West Indies, Eur., Greenland. 



West found originally lliis species among the leaves of a Lciuuhryuni 

 on trees; but later it has also been found under similar eonditions as 

 in llic ahove menlioned Icelandic sample, viz. in water on parts of 

 old piants. 



The shcaths assumed a distinct violet tint whcn trcated vvilh chlor- 

 zinc-iodine. 



II. Fischerella (Bornet et Flahaiilt) Goniont. 



Fischerella thermalis (Schwabe) Gom. 



Gomont 1895 p. 52. 



Sligonema thermolc Bornet et Flahault, Revision ITT p. 66. 



S. Icel. Reykjanes, warm soil (20—30") near the springs ^'/e 

 1896 (C. H. ().)! 



Area: Eur., Am., Auslr. 



The specimen from Reykjanes was originally determined by .lohs. 

 Schmidt and later on revised by Flahault. 1 have also examincd it and 

 have arrived at the conclusion that the dimensions of the threads are, 

 on the whole, somewhat large for the species. I found no hormogones. 



The species has often been found in and at hot springs; but also 

 on stones and earlh away from the springs. On Heykjanes uuiloublcdly 

 only acid sul|)hureous sj)rings are found, and presumably it must have 

 been in the vicinity of those thai F. thermalis has grown. This is the 

 more remarkal)Ie as the soil around this kind of springs generally is 

 absolutcly destitute of piants. 



Fischerella muscicola Thur. Gom. var. miner Hoye V. n. var. 



F. lilis primariis 8—12 // crassis. secundariis 4—5 // crassis, hor- 



mogoniis us(|ue ad 50 n longis, sæpissime brevioribus; vaginis chloro- 

 zincico jodurato cocrulescenlibus. 



