376 jons. BOYi; pki ehskn 



tain slopes, anionj^ mossos, and in a nioiintain cave Husted I 1922 1, 

 p. 99). 1 have loiind it niysell' in Denniaik 191') p. 295 in similar placcs. 

 The species has l)een foiind by Oslruj) in 48 samples from Iresh water, 

 so it mav perhaps he inferred Ihal in Iceland the species <*ro\vs |)re- 

 dominantly in water, thouj^li il ottcn occiirs as an aerial alj^a. cspecially 

 on (ianip rocks. 



Eunotia lunaris i\run. Van Heiirck, Synops. Pi. 35, figs. S-Ga. 



S. Icel. 295. 



Oniy a single specimen was found in the sample. Probahly a fni- 

 stiilc whitli has heen carried accidentally to tiiis locality. 



Eunotia paludosa (irun. A. Mayer 1918 p. 113, Taf. I, lig. 8, 9. K. lu- 

 naris var.? Boye Petersen 1924 III. p. 20. 



E. Icel. L. 4, 8, L. 123, 124. 129 - X. Icel. 140. 



I found this little Eunotia, which I have previously mcntioned as 

 E. lurutris var.? (loc. cit.\ in 5 samples from E. Icel. and 1 from N. Icel., 

 l)artly from mvri and partly among mosses and on vcrlical rock faces. 

 It has the foUowing dimensions: 1.15-26/*, br. 3,3— 3.7 // . str. 20— 23 

 in 10//. It is slighlly curvcd with jjarallel dorsal and ventral side, while 

 the ends are somctimes slightly upward curved. It tims shows a fairly 

 close correspondcnce with E. paludosa as described by A. Mayer (1. c). 

 It is also very rcminiscent of ccrtain forms of E. arcuala Stein ecke 

 (1916, p. 40, fig. 13), but it seems to nie that several species may lurk 

 under this name, none of the forms described agreeing closely with 

 Ihose observed by me. Østrup mentions the species as occurring in two 

 sam|)les. This s|)ecies occurrcd in a (piantity of individuals in not a 

 few of the samples of earth collccted by Molholm- 11 a nsen in the 

 summer of 1925. It may then be inferred that it is often i)resent on 

 the ground though it would secm as if it did not belong to the species 

 that will wilhstand much desiccation. 



Eunotia pectinalis (Dillw.) Rabenii. var. impressa O. Muller. A. Mayer 

 1918. p. 115, Tal. II. ligs. 23— 25. E. impressa var. angusta. V. Heurck 

 Synops. PI. 35, lig. 1. 



E. Icel. 4, 140. 



This is hardly any pronouncedly aerial species, though according 

 to Hustedt (1922, p. 99 it thrives well on irrigaled mossos, and so 

 may be c.xpccted to occur, inlor aiia, on myri in Iceland. Found by 

 Østrup in 30 samples from fresh water. 



Eunotia prærupta Ehrb. f. curta r.run. A. Mayei 1918 p. 103, Taf. I, 

 lig. 30 3 1. V. lloiirck .Synops. PI. 31. lig. 21. 



E. hel. 24. 28, L. 41, 68, L. 70, 85, 112, L. 123, 129 — N. Icel. 160, 

 252. 256 — W. Icel. 321, 336 — S. Icel. 295, 327. 



E. jinvrupla seoms in the main to bc an al|)ineborcal species. As 

 a matter of faet, Østrup found it in 82 samples from Iceland. In 15 



