445 
Assimilative hairs occurred on the plant in May and June, and 
are especially common as late as May, while in June hair-bearing 
specimens become rare. This agrees very well with what Rosen- 
vinge says is the case in South Greenland where the hairs fall 
off at 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 Faeroes 
as already reported by Lyngbye: — »Ad insulas Faeroenses copiose«. 
var. media (Ag.) J. Ag., Species Alg., I, p. 168; Rosenv., Gronl. 
Havalg., 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 Faeroese specimens exactly resemble 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 forma 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 places: — Vid.: Near Viderejde, 
great quantities were found floating in the sea after a storm (!); Bordo: 
In Haraldsund near Aaerne (!); Str.: Gliversnses (!), 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 Faeroese 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 this variety. 
