Gymnosporangium fuscum. [Descriptions of Fungi and Bacteria].
Abstract A description is provided for Gymnosporangium fuscum. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Aecia on pear (Pyrus communis) and other species of Pyrus. Telia on Juniperus chinensis, J. sabina, J. virginiana and others of the 'sabina' group. DISEASE: European pear rust. Aecia on leaves, causing thickened spots, and on cankers on the branches. Telia on fusiform swellings of juniper stems. GEOGRAPHICAL DISTRIBUTION: Widely distributed in Europe and extending to Asia (Lebanon, Syria and Turkey) and N. Africa (Algeria, Morocco). Also introduced into N. America (British Columbia and California) (CMI Map 387, ed. 2, 1975).