306 



F. B0RGESEX 



thallus is uneven and irregularly waved. The tips of the shoots are broadly 

 rounded. The angle between the branches approaches 90 . 



A few cystocarps occur; these are found near the end of the branches 

 and are almost globular. Above the cystocarp a short sterile narrow prolonga- 

 tion is observed. 



The plant is of a rigid cartilaginous or corneous texture. 



On a longitudinal section of the thallus (Fig. 47) we find that the sub- 

 cylindrical cells in the centre are arranged more or less in rows; outwards the 

 cells grow shorter with very thick walls and gradually pass into the cortical 

 layer, composed of short rows of small oval cells — upon the whole a picture 

 quite like that of Chondrus crispus as given by Kylin in Studien uber die 

 Entwicklungsgeschichte der Florideen (K. Svenska Vetenskapsakad. Handlingar. 

 Bd. 63, 1923). 



The new species appears to be most nearly related to the small species 

 G. densus and G. pygmaeus. 



Area of distribution: Endemic. 



Fam. Sphaerococcaceae. 

 Hypnea Lamx. 



H. Esperi Bory. — Fig. 48. 



Bory, Voyage de la Coquille, p. 157. Kutzixg, Spec. Alg., p. 759; Tabul. 

 Phycol., vol. 18, pi. 26, a, b, c. 



The thallus forms small entangled 

 masses among other algae. The filaments 

 are irregularly ramified, often antlerlike 

 in shape, the summit of the filaments 

 often being somewhat curved with short, 

 spine-like side-branches gradually growing 

 out from the convex side. The branches 

 are sometimes short, spinelike, sometimes 

 long and of indefinite growth. The tetra- 

 sporangia are formed in the branchlets. 



When a branch comes near a fa- 

 vourable substratum short thick discoid 

 hapters are formed by means of which 

 the plant is fastened to other algae. In 

 the same way the branches frequently 

 anastomose. 



The terete thallus is 400 — 500;.! thick. 



The specimens found seem to be in 

 good accordance with the fig. of Kt'TZING 

 in Tab. Phycologicae (1. a). 



Fig. 48. Hyj>m -/Bory. Part of sped- This P lant is closel y related t0 T the 



men with a tetrasporangium sorus. C. 25 /i. form I called Hypnea spinclla in my West 



