498 



figs. 58— 63; Conferva flacca Lyngb., Hydrophyt., p. 144; C. contorta 

 Lyngb., 1. c. p. 145. 



Tbe specimens referred to this species had from 1 — 3pyrenoids; 

 Ihe cells were about l /i as long as they were broad. The breadth 

 of the cell-filaments varied from about 20—60^. 



Lyngbye's Herbarium contains several gatheriugs ol Conferva 

 flacca; in those which I examined I found intermixed a large 

 Ulothrix, which, judging from the dried material, agreed well with 

 U. flacca; and Urospora mirabilis also occurred in several of the 

 gatherings. Lyngbye's Conferva contorta (Hydrophyt., p. 145) must 

 likewise be referred to the present species. His Herbarium con- 

 tains two gatherings of the latter, one from Kvalbo (Syd.) epiphytic 

 on the stem of Fucus, and one from rocks near Thorshavn; on 

 the packets he has written: — Conferva flacca var. contorta. 



This species has been found both on exposed and on sheltered 

 coasts, where it grows sometimes gregariously on rocks, and some- 

 times as an epiphyte on larger algæ. It occurred with zoospores in 

 May and June. 



The present species is doubtless commonly distributed along the 

 coasts of the Færoes. It had already been found by Lyngbye, who 

 writes with reference to it (1. c. p. 144): — »Ad insulas Færoenses saxis 

 insidens«, and (1. c. p. 145) »Habitat ad littora Færoensia stipitem infe- 

 riorem Faci vesiculosi viridi sno cæspite parasitice obvestiens«. 



171. U. pseudoflacca Wille, Studien iiber Chlorophyceen, p. 22. 

 The specimens referred to the present species appear to agree 



well with Wille's description (1. c). One large pyrenoid occurs 



in each cell, and the ribbon-shaped chromatophore is thickest where 



the pyrenoid is situated. The cells vary from about x li as long to 



about 16 n thick, thus agreeing with those of formå minor Wille, 



which also grow as an epiphyte. 



This species has been met with on exposed as well as on 



sheltered coasts as an epiphyte on different brown alga^ growing 



between tide-marks. Fruiting specimens were observed in June. 



I think it is common along the coasts of the Færoes though it has 

 hitherto been found only on Syd.: Trangisvaag (!), Vaags Ejde (!). 



172. U. consociata Wille. Studien iiber Chlorophyceen p. 25. 

 The specimens referred lo this species appear to agree fairly 



well with Wille's description. The cell-filaments were often adherent 



