471 
parent; prolifications often occur on it. A few specimens from 
Thorshavn somewhat resembled certain Greenland specimens which 
Rosenvinge has referred to 0 evanescens , but they not being 
especially characteristic I think we are justified in referring them 
to f. edentata. When dried the plants become almost black and 
nearly opaque. The midrib is quite indistinct and receptacles are 
shorter and broader than in f. edentata. 
A single specimen of typical f. edentata was noteworthy owing 
Fig. 93. Fuciis inflatus f. disticha. From Muletangen at Vaag's Ejde (Syd.). 1:1. (H. Westergaard del.) 
to its bearing conceptacles in the middle of a branch at a consider¬ 
able distance from the apex. 
Fucus in flatus occurs in the littoral zone or (f. edentata ) in the 
uppermost part of the sublittoral; f. disticha belongs exclusively 
to the littoral zone, and f. linearis occurs in tide-pools. The large 
forms of f. edentata require somewhat sheltered coasts, and also 
grow right in the interior of the fjords even in places where the 
water has a considerable admixture of fresh water; f. disticha can 
thrive in the most exposed localities. 
Fructifying specimens of this species were found in April, May, 
June, July and August, consequently, during the summer. Specimens 
gathered in October and November were sterile; in December a few 
specimens were found bearing young receptacles. 
