Coccomyces tumidus. [Descriptions of Fungi and Bacteria].
Abstract A description is provided for Coccomyces tumidus. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. DISEASE: Coccomyces tumidus is found on dead fallen leaves which are often beneath the surface of the leaf litter, and which often adhere to other adjacent leaves (making it, incidentally, rather infrequently recorded, although it seems to be not rare). Sometimes one or perhaps more other fungi are also present in the same pale areas. HOSTS: Leaves of Acer sp., Betula sp., Castanea sativa, Castanea sp., Fagus sylvatica, Fagus sp., Gaultheria shallon, Populus tremula, P. tremuloides, Populus sp., Quercus faginea, Q. garryana, Q. pedunculata, Q. rubra, Q. sessiliflora, Quercus sp., Rubus setosus, Rubus sp. (stem). Most records are on members of the Fagaceae. GEOGRAPHICAL DISTRIBUTION: Belgium, Canada (Nova Scotia, Ontario), Czech Republic, Denmark, Germany, Italy, Morocco, Poland, Rumania, Sweden, UK (England, Wales), USA (Maine, Massachusetts, New Hampshire, New York, Oregon, Virginia, Washington). Several unsuccessful searches for this fungus in southern Ukraine. TRANSMISSION: By air-borne ascospores in humid conditions. In the temperate northern hemisphere, most records of open ascocarps containing ascospores are from late summer and early autumn, suggesting that the fungus only infects senescent leaves just prior to natural leaf fall.