461 
DictyOsIPpHON HISPIDUS Kjellman, Algae of the Arctic Sea, 270. 
Resembles a slender, much branched D. foeniculaceus Grev., 
and grows in similar places. Beside the ordinary branches of in- 
definite growth, the frond is beset with tapering branchlets, 2-4 
mm. long ; these cover the whole plant, exceptthe base of the main 
stem and of the larger branches in old plants, from which they 
have apparently fallen off. The main stem is hollow, and the 
branches become hollow at an earlier stage of growth than in D. 
Soeniculaceus : the sporangia are smaller than in the latter. Origi- 
nally described as a form of D. foeniculaceus, it is now generally 
recognized as a good species. My specimens, collected at Nahant, 
Mass., in June,are of a darker brown in the dried state than Euro- 
pean specimens, which are more of an olive color; otherwise they 
agree well. 
ANTITHAMNION BOREALE (Gobi) Kjellman, Algae of the Arctic 
Sea, 180. 
A few small plants growing on Piilota pectinata Kjellm. were 
thrown upon the shore of Eagle Island, Penobscot Bay, Maine, 
after a storm in July, 1896. They seem to belong to forma zypica 
of Kjellman, and agree quite well with a specimen from northern 
Norway, received from Foslie. This species might be mistaken 
for a small form of 4. Americanum (Harv.) Farl., but the latter is 
Proportionally more slender and has longer cells. A. doreale sel- 
dom exceeds 3 cm. in length; the ultimate branches are secund 
oftener than opposite. .4, Americanum is a plant of early spring ; 
A. boreale of late summer and autumn. ~ 
RHODOMELA VIRGATA Kjellman, Algae of the Arctic Sea, I10. 
pl. 7, 
This species in its sterile state is hardly to be distinguished 
from R. subfusca Ag., the latter being, however, somewhat more 
densely and decompoundly branched. The distinction in fruit is 
Strongly marked; in R. subfusca the tetraspores are formed in 
Spring, in the slender terminal branches, which often become 
Somewhat moniliform. In 2. virgata they are found in winter, in 
short, densely branching ramuli, which issue without much order 
from the main stem and branches; cystocarps and antheridia 
occur in similar situstione: Both these forms of fruit have long been 
