|Major Groups > Polypores > Spongipellis unicolor|
by Michael Kuo
Spongipellis unicolor is kind of a big, doinky doofus among the polypores. Its large, spongy, buff-colored cap usually appears alone, on the side of an oak tree. Its pore surface is composed of large, angular pores that can become slot-like or even tooth-like in old age. It causes a white trunkrot, and while it is not often mentioned in field guides (perhaps because it's too much of a doofus?), it can be found wherever oaks occur on our continent.
Ecology: Parasitic on living oaks and occasionally on other hardwoods; appearing on the side of the tree, above ground; causing a white trunkrot; annual; usually growing alone; widely distributed in North America where oak species occur.
Cap: Up to 30 cm across and 20 cm deep; semicircular to kidney-shaped; convex; finely hairy to velvety, becoming finely velvety, matted, or bald; buff to pale brownish; without zones; the margin thick and rounded.
Pore Surface: Creamy, sometimes becoming dull yellowish with age; not bruising; with large, angular pores that measure 1-2 mm across and sometimes become slot-like or tooth-like with age, especially near the point of attachment; tubes 1.5-3 cm deep.
Flesh: Whitish; faintly zoned; spongy above and corky below.
Spore Print: Presumably white.
Microscopic Features: Spores 7-9 x 6-7 µ; smooth; broadly ellipsoid to ovoid; hyaline in KOH; inamyloid. Cystidia absent. Hyphal system monomitic; hyphae with conspicuous clamps and frequent branching.
Tyromyces unicolor and Polyporus obtusus are synonyms.
Cite this page as:
Kuo, M. (2010, March). Spongipellis unicolor. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/spongipellis_unicolor.html