360 Some New and Some Old Alga. [ZOE 
frond is so lubricous that it seems to creep until thoroughly dried. 
Our plant does not materially differ from the European except in 
being more robust. The fronds are mostly simple, occasionally 
branching dichotomously. I have only examined the cystocarpic 
plants, finding the fruit abundant, borne in the fan-shaped filaments 
near the surface of the frond., 
CALLITHAMNION RUPICOLUM, 2. sp. 
(Class RHODOPHYCEH. Order CERAMIACE.) 
Fronds densely tufted, twisted, and matted at the base; 
alternately pinnate, pinnz rather long and slender, distichous, 
emerging near middle of articulation; angles of axis obtuse. 
Tetraspores tripartite, oblong or obovate, borne almost always on 
upper side of ramuli, and near middle of articulation. ‘The whole 
Callithamni g 1 
p i. Sp. 
A. Tuft of branches, natural size, 
B. nified branch (about soo diameters) showing the tripartite tetraspores. 
The fine hairs are probably a parasite, but nearly all the older plants are thickly beset 
mot only with thin hairs, but many forms of diato 
