Nov: 1908.] BOTANICAL SOCIETY OF EDINBURGH 9 
Rhizoclonium arenosum, Kiitz.—Found growing upon 
small outcrops of rock upon the seashore near Roseau, 
Dominica, B.W.LI. 
Rhizocloniwm arenosum, var. Occidentalis, Kiitz— 
Found growing upon stones on the seashore near Roseau, 
Dominica, B.W.I. 
Note.—This variety differs from the type, chiefly in the lesser diameter 
of the filaments, usually only half that of the type —E. M. H. 
SARGASSACE. 
Sargassum Filipendula, C. Ag—Found growing upon 
small rocks upon the sea beach, Dominica, B.W.I.; Gulf of 
Mexico (fide J. G. Agardh); Florida, Melvill. 
Sargassum platycarpum, Mont.— Found growing upon 
small rocks upon the shore, Dominica, B.W.I.; Grenada, 
Murray ; Barbadoes, Dickie ; Guadeloupe, Mazé ; Martinique, 
Duperrey ; “Ad alias insulas Indiz Occidentalis” (Mus. 
Petropolit.), J. G. Ag. 
Geographical distribution Warm Atlantic. 
Sargassum pteropleuron, Grunow.—Found growing upon 
small rocks upon the sea beach, Dominica, B.W.I. ; Bahamas, 
“ Novara’; Florida, Palmer. 
Sargassum vulgare, C. Ag—Found growing upon small 
stones on the sandy beach, Portsmouth, Dominica, B.W.L. ; 
Grenada, Murray; Barbadoes, Dickie; Guadeloupe, Mazé ; 
Jamaica, Sloane, Chitty; Cuba, R. de la Sagra; Florida, 
Harvey, Melvill; Bermuda, Kemp, Rein. 
Note.—The species of the genus Sargassum are almost impossible to 
determine with certainty in the absence of fructification, from the great 
similarity of the leaves or frondlets of species which have very different 
fructification. There is little doubt that extended observation would 
reveal other species on the shores of these islands, since twenty-five 
species are enumerated in the “Algues de Guadeloupe” as occurring 
in that island.—E. M. H. 
DICTYOTACE. 
Haliseris delicatula, J. Ag—Found growing on a few 
small rocks on the sandy beach, Portsmouth, Dominica, 
B.W.1.; Grenada, Murray; Barbadoes, Dickie ; Guadeloupe, 
Mazé; Cuba, R. de la Sagra; shores of Mexico (jide J. G. 
Agardh). 
