Ganoderma curtisii

Ganoderma curtisii is a wood-decaying polypore found in eastern North America.

Ganoderma curtisii
Maryland, 2023
Scientific classification
Domain:	Eukaryota
Kingdom:	Fungi
Division:	Basidiomycota
Class:	Agaricomycetes
Order:	Polyporales
Family:	Ganodermataceae
Genus:	Ganoderma
Species:	G. curtisii
Binomial name
Ganoderma curtisii (Berk.) Murrill (1908)
Synonyms[1]
Polyporus curtisii Berk. (1849) Fomes curtisii (Berk.) Cooke (1885) Scindalma curtisii (Berk.) Kuntze (1898)

Ganoderma curtisii Mycological characteristics
	Pores on hymenium
	Cap is offset
	Hymenium is decurrent or subdecurrent
	Stipe is bare
	Spore print is brown
	Ecology is saprotrophic

Taxonomy

The name was originally established by Miles Berkeley in 1849 as Polyporus curtisii, and later transferred to the genus Ganoderma by William Alphonso Murrill in 1908. This species is tentative and is a subject of debate as to its viability as a distinct species from North American specimens described as G. lucidum (G. sessile), which is much more widely distributed throughout the US. There is also debate about the identities of several species that resemble G. lucidum and G. tsugae.

One reason for an alleged synonymy between G. sessile and G. curtisii is overlap in habitat, decaying hardwoods. According to Volk, Gilbertson and Ryvarden, authors of North American Polypores, it is not considered a separate species from G. lucidum. Bessette et al., authors of Mushrooms of the Southeastern United States, echo this and list it as a synonym to G. lucidum.^[2] Paul Stamets considers G. lucidum and G. curtisii to both be members of a tight-knit species complex.^[3]

However, several recent molecular studies have shown Ganoderma curtisii to be genetically distinct from G. lucidum, calling into doubt the synonymy of the two species and supporting previous mycologists' opinion that it is a distinct species.^[4][5][6] The same studies support the idea that G. lucidum sensu stricto is actually absent from the North American continent and that the mushroom widely called G. lucidum in North America is instead G. sessile, a member of the Ganoderma resinaceum complex, with G. curtisii as a separate species.

Description

This polypore bears a marked resemblance to G. lucidum and generally has a stipe, sometimes lacking the characteristic red to purple varnished appearance that G. lucidum possesses. The flesh is spongy in pore tissue and firm in the stipe. The pores bruise brown when damaged.

Its habitat of choice is decaying stumps and roots of hardwoods, which aligns perfectly with that of G. sessile.

Distribution and habitat

The species is primarily found in the Southeastern United States.^[7][8] Craig and Levetin claim to have observed it in Oklahoma.^[9]