351 
is found both on sheltered and exposed shores, but more commonly 
on the latter. Specimens bearing monosporangia were met with 
from April to November, and may doubtless be found all the year 
round. 
It was first found by Lyngbye and is very common everywhere. 
9. C. virgatula (Harv.) Thur. Le Jobs, Alg. mar. de Cherb., p. 106; 
Kjellm., N. L, p. 166 (130). 
Some of the specimens which I have referred to this species 
and one of which 1 have shown in tig. 52 approach most closely 
to Trentepohlia virgatula Farlow 
in »Marine Algse of New Eng¬ 
land^ p. 109, tab. X, fig. 3. The 
short branches bearing mono¬ 
spores are very often opposite 
and those in the upper part of 
the plant especially terminate 
in long hairs. Chromatophores 
are star-like, as may distinctly 
be seen in the young sporangia. 
The cells in the long branches 
are about 10 g thick. 
Other specimens differed 
from these in being almost 
devoid of hairs, and only after 
close examination were a few 
branches found terminating in 
hairs: these specimens which 
were gathered near Velbestad 
epiphytic on Gigartina mamil- 
losa were further especially 
noteworthy because they bore 
both monospores and tetra- 
spores. As is well-known, Har¬ 
vey figures in Phycologia Brit., 
pi. 313 a Gallithamnion virga- 
tulum bearing monospores as 
well as tetraspores 1 , but as is 
equally well-known this report filament with monospores (partly emptied). 100 : 1 . 
1 and in fhe following plate he shows the same to be the case in Gallithamnion 
Daviesii. 
