OX XLQM COLLECTED FROM HEARD ISLAND. 47 



Ulva latissima, L. 



Geog. distr. Very general in both hemispheres. 



CONFEETACE^:. 



Cladophora rupestris, L. 



Geog. distr. General between arctic circle and Mediterranean ; Kerguelen 

 only in S. hemispl 



C. arcta, Dillw. 



Geog. distr. German and Atlantic Oceans ; Cape Horn and Falk- 



lands. 



Oscillariace^; 



Calothrix olivacea, H.f. $ Harv 

 Growing upon Nitella flexilis. 



XXV. Algse collected by Mr. Moselet at Heard Island, 

 250 miles S. of Kerguelen. By George Dickie, M.D., 



F.L.S. 



[Bead February 4, 1875.] 



FuCACEJE. 



Scytothalia obscura, n. sp.? 



Frondibus e radice callosa, inferne simplicibus, superne decomposito- 



pinnatis ; phyllodiis linearibus, apicibus indivisis vel bifidis, acutis ; 



receptaculis ? 



A solitary specimen, having several fronds from a scutate root, 

 agreeing in structure and general habit with the genus Scytothalia. 

 What seem to be immature receptacles are crowded on the mar- 

 gins and surface of the fronds. 



Sporochnacej:. 



Desmarestia Rossi j, H.f. # Harv. 

 Geog. distr. Cape Horn and Falklands. 



Laminariace^e. 



Lessonia nigrescens, Bory. 

 Geog. dist. Chili to Cape Horn. 



L. ovata, H.f. ty Harv. 



Geog. distr. Cape Horn and Falkland Islands. 



