Abstract A description is provided for Rigidoporus zonalis . Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On Bauhinia purpurea, Ceiba pentandra, Ficus benghalensis, Hevea brasiliensis, Mangifera indica, Sapindus trifoliatus, Shorea robusta, Syzygium cuminii, Tectona grandis and Toona ciliata . DISEASE: White pocket rot. GEOGRAPHICAL DISTRIBUTION: Africa (Cameroon, Ghana, Sierra Leone, St. Thome, Uganda); Asia (Ceylon, Hong Kong, Japan, Malaysia (W., Sarawak), Philippines, Singapore); Australasia & Oceania (Australia, New Caledonia, New Guinea, New Hebrides); North America (U.S.A. : Ark., Miss., Tenn., Tex., Va.); Central America & West Indies (Bahamas, British Honduras, Cuba, Jamaica, Trinidad), South America (Bolivia, Brazil, Colombia, Venezuela). TRANSMISSION: By air-borne spores. Spores have been recorded infecting wood and vegetative mycelium has been observed to spread over unsterilized wood and moist sand (46, 2543).