Additional Studies of Species of Elsinoe and Sphaceloma

Abstract

SUMMARYThis paper presents data on the identity, history, and host and geographic range of members of the genus Elsinoe and of the form genus Sphaceloma. The Italian fungus, Hadrotrichum Populi var. Arbuti, is recognized as a Sphaceloma and as a synonym of Illosporium mattirolianum, and the new combination of S. mattirolianum made. Typical lesions produced by this fungus are present on phanerogamic herbarium specimens from Germany, showing that the organism is distributed in that country. Data on the history, identity and distribution of the American species, Elsinoe Ledi on Labrador tea, including studies leading to the discovery that the organism was described by Peck as Aulographum Ledi, are reported. In cultures of this organism grown on potato-dextrose agar medium, at the constant temperatures of 0°, 5°, 10°, 15°, 20°, and 25° C., and at room temperature E. Ledi produced optimum growth at 15° and 20° C., while other species of Elsinoe or Sphaceloma produced optimum growth at 20° and 25° C. and at room temperature. The distribution of Sphaceloma Symphoricarpi on snowberry in Maine, Virginia, and California was ascertained through examination of dried phanerogamic herbarium specimens of snowberry from these states.