524 
As mentioned above it grows as an epiphyte on Polysiphonia 
fastigiata , and like Dermocarpa prasina it occurs in small, roundish, 
almost semi-globular growths, or when several such grow together, 
in cusliion-like expansions, irregularly shaped. In a transverse sec¬ 
tion, or, better still, on separating the cells by means of a gentle 
pressure, they prove to be (fig. 108) cylindrically club-shaped, nar¬ 
row at the bottom and widening upwards to the top, and with 
homogeneous contents of a bluish-green colour. The cells are about 
60—90 p long and about 30 p broad. The entire contents of the 
cells are transformed into a very considerable number of small 
conidia; the latter are about 2,5 p broad. As may be seen from 
this description the present plant differs essentially from D. prasina 
in having larger cells and much smaller conidia. 
Conidiiferous specimens occurred in May. 
Found hitherto only on Syd.: Tvseraa (!), 
205. D. violacea Crouan (?), Algues marines nouvelles de la rade 
de Brest. (Anm. sc. nat. IV Ser., Bot., IX. 1858, p. 70). 
Epiphytic on Ralfsia verrucosa which grew on exposed rocks 
in the sea. I found a very small quantity of a Dermocarpa which 
I refer very doubtfully to D. violacea. The cells are pear-shaped, 
and the cell-contents of a yellowish-brown colour, sometimes faintly 
blue-green. The entire contents of the cells are produced into co - 
nidia, which are about 1,5—2 p in diameter. The cells are 24—30^ 
long and as much as 16 p broad. It differs more particularly from 
Crouan’s description by its different colour and by its conidia 
appearing to be somewhat smaller. 
Found on rocks in the sea off the north-west point of Videro(l). 
PLEUROCAPSA Thur. 
206. P. amethystea Rosenv. var., Johs. Schmidt 1 . 
Found epiphytic on Rhodochorton Rothii, consequently, in the 
same habitats as the latter. It has been found on almost all the 
material of Rhodochorton brought home and must therefore be re¬ 
garded as common along the coasts of the Faeroes. 
1 This variety was determined by Mr. Johs. Schmidt whose notes on it will 
appear in Helgi Jonsson’s paper »The Marine Algte of Iceland* in »Botanisk 
Tidsskrift«. 
