218 Rhodora [AvcusT 
FURTHER NOTES ON RHADINOCLADIA. 
R. E. SCHUH. 
IN RHODORA, Vol. II, pp. 111 and 112 (June, 1900), appeared a 
description of Rhadinocladia, a new genus of brown algae. Because 
of the scarcity of specimens no formal attempt was made to present 
all its generic characters. The discovery of additional material, 
including at least one undescribed species, makes an effort in this 
direction seem more promising at the present time. 
RHADINOCLADIA, Schuh. 
‘Small plants, often growing in loose tufts. Basal layer several 
cells in thickness except near the edges, adhering closely to the sub- 
stratum and originating one to eight branching fronds, which possess 
a well-defined central axis one or more cells in width. Axis bearing 
numerous long and slender branches, with many or few ramuli and 
occasional hairs. Plurilocular sporangia cylindrical or oblong, sessile, 
abundant and entirely superficial A variable genus allied to 
Desmotrichum. 
r. R. Fartowit Schuh (l. c.) Basal layer mostly producing but 
one plant. Central axis apparent, usually of several series of cells 
except at the narrower base; branches given off at acute angles, 
long and flagellate, cells mostly uniseriate, ramuli few and rather 
short. About 16 mm. high. Fruit bluntish, elliptical-oblong, scat- 
tered, 20-25 u wide, 70-85 y long. 
In summer on Chorda in Vineyard Sound, Massachusetts and on 
Zostera in Narragansett Bay, Bristol, Rhode Island. 
2. R. cylindrica, n. sp. Axis usually monosiphonous occasion- 
all with binate cells, with slender divaricate branches bearing 
numerous patent ramuli. About 3-8 mm. high, ordinarily producing 
several thalli from the same basal layer. Plurilocular sporangia 
very densely clustered along the axis and branches, their bases much 
compressed by crowding, very long cylindricai, with rounded tip. 
Size 60-80 X 15-18 y. 
Always on Zostera, in midsummer and autumn, in Bristol Harbor , 
Rhode Island. 
SOUTH BRAINTREE, MASSACHUSETTS. 
