A new Inonotus (Basidiomycota, Hymenochaetaceae) from Hawai'i

Inonotus hemmesii is described as a new species causing a white heartrot of living hardwoods in the Hawaiian Islands.It is characterized by large pileate basidiocarps, frequent setal hyphae in the tube trama, rare hymenial setae, and pigmented, ovoid to ellipsoid basidiospores.This paper reports a previously undescribed species in the genus Jnonotus P. Karst.It is associated with a white heartrot of koa and some introduced hardwoods in the Hawaiian Islands.Current records are from the islands of Hawai'i, Moloka'i, and O'ahu, and it is particularly common on manele (Sapindus saponarius L.) on the island of Hawai'i.