Ganoderma sessile

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Ganoderma sessile is a species of polypore fungus in the Ganodermataceae family. There is taxonomic uncertainty with this fungus since its circumscription in 1902. This wood decay fungus is found commonly in Eastern North America, and is associated with declining or dead hardwoods. Murrill described 17 new Ganoderma species in his treatises of North American polypores, including for example, G. oregonense, G. sessile, G. tsugae, G. tuberculosum and G. zonatum. Most notably and controversial was the typification of Ganoderma sessile, which was described from various hardwoods only in the United States. The specific epithet "sessile" comes from the sessile (without typical stem) nature of this species when found growing in a natural setting. Ganoderma sessile was distinguished based on a sessile fruiting habit, common on hardwood substrates and occasionally having a reduced, eccentric or "wanting" stipe. In 1908, Atkinson considered G. tsugae and G. sessile as synonyms of G. lucidum, but erected the species G. subperforatum from a single collection in Ohio on the basis of having “smooth” spores. Although he did not recognize the genus Ganoderma, but rather kept taxa in the genus, Polyporus, Overholts considered G. sessile as a synonym of the European G. lucidum. In a 1920 report on Polyporaceae of North America, Murrill conceded that G. sessile was closely related to the European G. lucidum.