Neoholmesia,a new genus of the delesseriaceae (Rhodophyta)

A new genus,Neoholmesia, is established on the basis ofHolmesia japonica (Okamura) Okamura. Neoholmesia that is distributed in the Northern Honshu and Hokkaido, Japan, should be placed in theMembranoptera group described by Kylin because of its apical segmentation of the thallus, and because it differs from the genusHolmesia in that tetrasporangia are found scattered randomly over the surface of the main thallus, and in that it bears carposporangia in chains. Dedicated to Prof. Shoichiro Usami celebrating his sexagenary birthday.