A description is provided for Capnodium salicinum. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: recorded from living leaves and twigs of a wide variety of species, including species of Acer (Aceraceae), Baccharis (Compositae), Bursaria (Pittosporaceae), Castanospermum (Leguminosae), Casuarina (Casuarinaceae), Citrus (Rutaceae), Epacris (Epacridaceae), Helichrysum (Compositae), Leptospermum (Myrtaceae), Pittosporum (Pittosporaceae), Populus (Salicaceae), Salix (Salicaceae), Syncarpia (Myrtaceae) and Ulmus (Ulmaceae). DISEASE: sooty mould; saprobic on honeydew and plant exudates, apparently without a deleterious effect on the plant apart from loss of photosynthetic capacity; this has been demonstrated for other species of Capnodium. GEOGRAPHICAL DISTRIBUTION: widely distributed; recorded from Australia, Cameroun, France, Hungary, Russia, South Africa, United Kingdom, USA (California, Montana, Wisconsin) and Zimbabwe. TRANSMISSION: the ascospores are presumably air-dispersed and the conidia transmitted via water-splash, but there is no experimental evidence to support these suppositions.