184 THE VOYAGE OF H.M.S. CHALLENGER. 



CERAMIACE.E. 



Microcladia moseleyi, Dickie. 



Microcladia moseleyi, Dickie in Journ. Linn. Soc. Lond., xiv. p. 385. 



Fronde sursum compressa, csespitosa, parce dichotonia, apicibus obtusis incurvis ; 

 spheerosporis irregulariter dispositis. 



Tristan da Cunha. — Endemic. Moseley. 



" There are already four known species of this peculiar genus, viz. : — Microcladia 

 glandulosa, found in South Britain, France, Spain, and the Mediterranean; Microcladia 

 coulteri, Harv., from California ; Microcladia borealis, Rupr., found at Nootka, Fort 

 Vancouver, Unalaschka, and Golden Gate, California; and Kiitzing has described Micro- 

 cladia tenuis, from the Gaboon, Guinea. This new species, which I have named after the 

 discoverer, seems in general habit to be nearest to the British, but differs in being more simple 

 in the form of the terminal ramuli and distribution of the tetraspores ; the transverse 

 section also shows a trreater number of larcre cells surrounding the central tube." — Dickie. 



o o o 



Centroceras clavulaturn, J. G. Agardh. 



Centroceras clavulaturn, J. G. Agardh, Sp. Alg., ii. p. 148; Dickie in Journ. Linn. Soc. Lond., xiv. 

 p. 3S6. 



Tristan da Ctjnha. Moseley. 



Widely distributed in both hemispheres. 



Centroceras oxyacanthum, Kiitz. 



Centroceras oxyacanthum, Kiitz., Pliyc. Gener., p. 742, et Sp. Alg., p. G89 ; Dickie in Journ. Linn. 

 Soc. Lond., xiv. p. 38G. 



Tristan da Ctjnha and Inaccessible Island. Moseley. 

 West Indies ; Cape of Good Hope. 



CHLOROSPERME.E. 



Ulvace^e. 

 Porphyra laciniata, K. A. Agardh. 



Porphyra laciniata, K. A. Agardh; Kiitz., Sp. Alg., p. G92 ; Dickie in Journ. Linn. Soc. Loud., xiv. 



p. 386. 

 Ulva umbilicalis, Linn. ; Thouars, Esquisse Fl. Trist., p. 25. 



Tristan da Ctjnha. Moseley; Thouars. 



Widely spread. 



