36o 



So7ne Neiv and Some Old AlgcB. 



[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, n. sp. 



{Class Rhodophyce^. Order Ceramiace^.) 



Fronds densely tufted, twisted, and matted at the base; 

 alternately pinnate, pinnae 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 



Callithamnion rupicolum, n. sp. 



A. Tuft of branches, natural size. 



B. A magnified branch (about 500 diameters) showing the tripartite tetraspores. 

 The fine hairs are probably a parasite, but nearly all the older plants are thickly beset 

 not only with thin hairs, but manj' forms of diatoms. 



