Cyttaria darwinii. [Descriptions of Fungi and Bacteria].
Abstract A description is provided for Cyttaria darwinii. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. DISEASE: A highly evolved and highly specific obligate parasite causing often spectacular cankers only on branches of Nothofagus species. Fruitbodies only appear on the cankers; this fungus does not cause wood decay. HOSTS: Nothofagus antarctica, N. betuloides, N. dombeyi, N. pumilio, Nothofagus sp. (Fagaceae); more than 70% of all records are from N. antarctica and N. pumilio. GEOGRAPHICAL DISTRIBUTION: SOUTH AMERICA: Argentina (Chubut, Neuquén, Río Negro, Santa Cruz, Tierra del Fuego); Chile (Aisén, Los Lagos, Magallanes y Antártica Chilena, Bío-Bío, Maule). Highest recorded altitude: 1700 m. TRANSMISSION: Not known, but presumably infection is by wind-dispersed ascospores. The reasons postulated by INGOLD (1988) for evolution of the golf ball shape of fruitbodies of Cyttaria espinosae [IMI Descriptions No. 1593] are doubtless also valid for this species.