Byssomerulius corium: The Ultimate Mushroom Guide
About The Byssomerulius corium Mushroom
Byssomerulius corium is a common species of crust fungus in the family Irpicaceae. It is a highly distributed fungus and has been recorded in Africa, Asia, Australia, Europe, and in South, Central, and North America.
This mushroom is common on the undersides of both hardwood and conifer branches. Fruitbodies are initially resupinate with a smooth, white hymenial surface; as they mature, the margin becomes reflexed and develops into a narrow, elongated white cap, and the hymenium becomes merulioid to almost poroid and cream-colored. The soft tissue and mostly resupinate fruitbodies distinguish this species from tougher Stereum species that form distinct, fan-shaped, imbricate caps.
Other names: Netted Crust.
Byssomerulius corium Identification
Irregular but mostly resupinate, sometimes forming brackets. Fruitbodies coalesce to form large patches or tiered brackets with the lower (fertile) whitish surface covered in snaking net-like ridges or elongated warts. The pale upper surface, where visible, is faintly zoned and fibrous or finely downy, becoming finely hairy at the margin.
Elongated ellipsoidal to cylindrical, smooth, 4.5-7.5 x 2.3-3Î¼m; hyaline or very nearly so; inamyloid.
Odor and Taste
No noticeable odor; very tough when dry, waxy when wet, but tasteless.
Habitat & Ecological Role
Saprobic, on fallen hardwood trees, branches, and twigs, mostly on the undersides; commonly on Ash, causing white rot.
Byssomerulius corium Look-Alikes
Sometimes entirely resupinate and then similar in form to Netted Crust, but it is usually various shades of greyish-orange.
Has underside with jagged pores to flat teeth (microscope: encrusted cystidia).
Is a northern species on alder (Alnus).
Byssomerulius corium Taxonomy & Etymology
This mushroom was described in 1783 by French naturalist Jean Baptiste Francois (Pierre) Bulliard, who gave it the name Auricularia papyrina. The basionym (first valid name) dates from the 1801 publication of Christiaan Hendrik Persoon's Synopsis Methodicae Fungorum (and subsequently sanctioned in 1828 by Elias Magnus Fries) in which Netted Crust is given the name Thelephora corium.
The currently-accepted scientific name Byssomerulius corium dates from a 1967 publication by the Estonian mycologist Erast Parmasto (1928-2012), who designated Byssomerulius corium as the type species of its genus.
Synonyms of Byssomerulius corium include Auricularia papyrinaÂ Bull., Thelephora corium Pers., Boletus purpurascensÂ DC.,Â Merulius confluensÂ Schwein.,Â Merulius coriumÂ (Pers.) Fr.,Â Merulius aurantiacusÂ Klotzsch, and Merulius papyrinusÂ (Bull.) QuÃ©l.
Byssomerulius, the genus name, comes via Greek from the Latin byssus, meaning fine silk-like cloth and is probably a reference to the many fine maze-like ridges that pattern the surface of these fungi rather like interlocking jigsaw pieces, and -merulius is the name (origin obscure) of the closely-related Merulius crust fungus genus.
The specific epithet corium means skin or hide, as in leather, and is a reference to the resupinate skin-like form that the fruitbodies of this species take.
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