513 



possibility of keeping this species di stind from A. incurva Kjellm. on 

 the strength ofthe differences in the structure of the chromatophore. 



190. A. grandis Kjellm.? 



This species is recorded with some hesitation by Si m mons 

 (1. c. p. 274). He had senl his material lo Kjellman to be deter- 

 mined, but since it was not in a suitable stale of development, the 

 determination is nncertain. 



Simmons likewise records Spongomorpha Sonderi Kutz. witb 

 doubt. »Exemplare, die wahrscheinlich dieser angelioren, wurden 

 im Trangisvaagfjord gesammelt«. Judging from a dried specimen I 

 have had for examination it is doubtless like Acrosiphonia albescens. 



SPONGOMORPHA Kutz. 1 



191. S. lanosa (Roth) Kutz. 



I have only had seanty material for examination, as the speci- 

 mens eolleeted were few in number, and were, moreover, sterile; 

 hence I have preferred to retain Kiitzing's older name for this 

 species and have also adopled his delinition of it, the more so as I 

 lune not been able witb any certainty to identify it with any of 

 Kjellman's species; among the latter niv specimens seem to come 

 nearest to Spongomorpha (Acrosiphonia) bombycina Kjellm. (1. c. p. 96). 



The thicker branches varied from about 25 to 30 ,u. 



Seems to be very rare along the coasts oi' the Færoes. Found only 

 in shallow water epiphytic on Cladophora rupestris, Str.: Sundene be- 

 tween Thorsvig and Kvalvig (!). 



The Conferva uncialis Lyngb. recorded by Rostrup (1. c. p. NT 

 from Thorshavn maj' probably be referred to tins s|)ecies. 



CLADOPHORA Kutz. 



192. C. rupestris (L.) Kutz. Kjellm., N. I., p. 377 (307); Conferva 

 rupestris Lyngb., Hydrophyt., p. 156, tab. 54 B. 



Found bolh in the littoral zone, usually near low-water mark. 

 and in the sublittoral, where the water is not very deep. It is 

 met witb on open coasts as well as in shellered localities, and 

 grows on stones and rocks, often covering these witb a dark-green, 

 dense growth. It often occurs growing below species of Fnats, etc. 

 The specimens growing uppermost often develop less vigorously; 

 one such poorly developed form bas been cailed by Simmons 



1 Cfr.Wille i Botaniska Notiser 1899, p. 281. 



