NEW SPECIES OF CERAMIACEAE (RHODOPHYTA) FROM THE HAWAIIAN-ISLANDS

New species are described for Euptilocladia, Ptilocladia, Callithamnie lla, Antithamnion and Anotrichium (Ceramiaceae, Ceramiales). Euptilocl adia has not been reported previously outside Australia. E. magruderi sp. nov. differs from Australian species in having proximal corticatio n, whereas cortication is both distal and proximal in the Australian s pecies. Ptilocladia yuenii sp. nov, differs from the five known specie s in habit, small size, and in being uncorticated, the latter feature not shared with ether species. Callithamniella pacifica sp. nov. resem bles other species in the genus in vegetative structure, but has large r tetrasporangia than any of the three other known species. Antithamni on erucacladellum sp. nov. has only two whorl branchlets per whorl. Th ey bear very short secondary branchlets and short condensed lateral br anches which resemble gemmae that, if capable of vegetative reproducti on, may be similar to those of Amoenothamnion planktonicum Wollaston. Anotrichium celiana sp. nov. is shown to have vegetative and reproduct ive features different from those of the widely distributed A. tenue ( C. Agardh) Naegeli with which it was previously confused.