445 



Assimilative hairs occurred on the plant in May and .lime, and 

 are especially common as late as May, while in June hair-bearing 

 specimens bccome rare. This agrees very well with what Rosen- 

 vinge says is the case in South Greenland where the hairs t'all 

 oli' al the latest in June, while in North Greenland hair-bearing 

 specimens have been observed as late as July and August. 



This species is extremely common along the coasts of the Færoes 

 ;is already reported by Lyngbye: — Ad insulas Færoenses copiose«. 



var. media (Ag.) J. Ag., Species Alg., I, p. 168; Rosenv. , Grønl. 

 Ha valg., p. 858; Desm. hybrida Kiitz., Phyc. germ., p. 274, Tab. 

 phyc, Vol. IX, tab. 93. I think that Ectocarpus densus Lyngb. 

 (Hydrophyt., p. 133) ought also to be referred to this variety; it is 

 at any rate a richly hair-bearing Desmarestia aculeata. 1 



The Færoese specimens exactly resemhle the above-mentioned 

 figure and answer in other respects very well both to Rosenvinge's 

 description (1. c.) and to the Greenland specimens in the herbarium 

 of the Botanical Museum in Copenhagen. 



The specimens referred to this variety are far more densely 



covered with hairs than is the case with the main form and the 



hairs are also much longer. Sometimes a few, sometimes several 



of the bottom branches are opposite. It also retains its hairs much 



longer than formå typica, specimens gathered in July and August 



being closely covered with hairs. Spines were wanting, only a 



single specimen having on one of its branches a few which were 



not, however, typically developed. Thus we see typical var. media 



differs rather widely from typical Desm. aculeata and, consequently, 



it ought perhaps more properly to be regarded as a distinct species. 



In habit it reminds one much of Chorda tomentosa if one can 



imagine the latter branched. 



It has been found in the following piaces: — Vid.: Near Viderejde, 

 great quantities were found lloating in the sen atter a storm !); Bord 6: 

 In Haraldsund near Aaerne !); Str.: Gliversnæs (!), Kvivig (Lyngbye ; 

 Syd.: Trangisvaagfjord (Ostenfeld). 



137. D. ligulata (Lightf.) Lamour. Desmia ligulata Lyngb., Hy- 

 drophyt., p. 33. 



I once fished up some specimens of this species in a plaice 

 net from a depth of some 3 — 4 fathoms in Kvalbofjord (Syd), but 



1 The Færoese specimen preserved in Lyngbye's Herbarium is certainly very 

 small and has no opposite branches, but otherwise it agrees well with the spe- 

 cimen of Desm. aculeata which I have referred to tbis variety. 



