366 



nearly all the branches are opposite (cfr. Lyngbyes's fig. 1. c), in 

 others only a few, and all stages are met with intermediate between 

 these extremes. The main filament mav attain to a breadth of as 

 much as 4 — 5 mm. Small specimens of this variety, consi sting 

 only of stem and opposite branches, are doubtless identieal with 

 var. pyramidalis Thur. (cfr. Le Jolis, Liste, p. 132). 



A peculiar form with numerous small, irregular branches was 

 found by Ostenfeld in Trangisvaagfjord. 



A form has sometimes been fonnd at the bottoms of fjords 

 with long, almost linear branches, consequently, resembling the 

 slender forms of, e. g. Euthora cristata and Rhodophyllis dichotoma 

 met with in similar localities. 



Lyngbye's Herbarium contains only some very imperfect spe- 

 cimens of his /3 cæspitosum (1. c. p. 69), from which no definite con- 

 clusion as to its habit can be formed, and which do not appear 

 to be particularly characteristic according to his description. 



This species generally grows in the sublittoral zone along the 

 coasts of the Færoes and mav occur at fairly considerable depths. 

 I dredged it from various depths of about 15 fathoms, and Si in mons 

 (1. c. p. 266) mentions having found it in the »elittoral« zone; but it 

 also occurs in the littoral zone near low-water mark , where it is 

 very common in clefts of rock and in caves. It grows attached 

 to rocks and stones, as also epiphytic especially on the stems of 

 Laminaria hgperborea. Though it grows by preference in the open 

 sea along the most exposed coasts, it is not uncommon in the in- 

 terior of fjords where it is also found epiphytic on Lam. færoensis. 



Tetraspore -bearing specimens were found in May, June, July, 



August and November, cystocarpic in June, July and August. 



This is a ver}' common species of the Færoese coasts; it was first 

 found by Lyngbye 1. c.;, who writes with reference to its habitat: — 

 Habitat ad littora Færoensia saxis et stipitibus Laminariæ saccharinæ 

 adnascens.« 



21). L. rosea (Harv.). 



Found growing near low-water mark as well as in the sub- 

 littoral zone in deep water. It prefers exposed coasts. I found 

 tetrasporic specimens only in May and June. 



Tbis species appears to be rather rare along the Færoese coasts. 

 Ost.: Molen prope Ejde (!) near low-water mark intermingled witb 

 Corallina, Ejde H. S. ; Sir.: Kalbakfjord (!), specimens very small, and 

 determination uncertain; Kolter(!) on Lam. hyperborea al a depth of 

 some 10—15 fathoms; Syd: Kvalbo Ejde dl. S.. 



