Ganoderma are characterized by basidiocarps that are large, perennial, woody brackets, also called "conks". They are lignicolous, leathery, and either with or without a stem. The fruit bodies typically grow in a fanlike or hooflike form on the trunks of living or dead trees. They have double-walled, truncate spores with yellow to brown ornamented inner layers.
Ganoderma applanatum is a bracket fungus with a cosmopolitan distribution. The spore bodies are up to 30-40 cm across, hard, woody-textured, and inedible; they are white at first but soon turn dark red-brown.
It is a wood-decaying fungus, using primarily dead heartwood, but also as a pathogen on live sapwood, particularly on older trees. It is a common cause of decay and death of beech and poplar, and less often of several other tree species, including alder, apple, elm, horse-chestnut, maple, oak, walnut, and willow.
A peculiarity of this fungus lies in its ability to be as a drawing medium for artists. When the surface is rubbed or scratched with a sharp implement, it changes from light to dark brown, producing visible lines and shading.
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