Aurantiporus fissilis

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A slightly aged Aurantiporus fissilis. Photo by Kerry Woods
Aurantiporus fissilis pores. Photo by Kerry Woods

Taxonomy and Systematics

Kingdom: Fungi

Subkingdom: Dikarya

Phylum: Basidiomycota

Subphylum: Agaricomycotina

Class: Agaricomycetes

Order: Polyporales

Family: Polyporaceae

Genus: Aurantiporus

Species: Aurantiporus fissilis (Berk. & M.A. Curtis) H. Jahn ex Ryvarden

Descriptive notes

I had A LOT of difficulty identifying this mushroom. I could not decide whether it was Polyporus admirabilis, Antrodiella fissiliformis, Aurantiporus fissilis -- or some other related (or unrelated) species. I finally settled on Aurantiporus fissilis (Tyromyces fissilis until recently) for several reasons -- the most notable of these being: the pore surface (it closely resembles those in photos of A. fissilis, and has 1-3 pores per mm), the rubbery flesh, and the white mold that covers the lower surface of the mushroom. My specimen also stains yellowish and then reddish when bruised or dried -- a feature of A. fissilis. I believe my specimen has the distinctive A. fissilis "cheese-like odor" as well.

The caps of A. fissilis are 6-30 cm across, 4-10 cm wide, and 1-7 cm thick, semicircular (like a Trametes) and nearly fuzzy on top. Cap and flesh are white to cream or yellow. Stem is lateral, rudimentary, or absent. Spore print is white, cream, or yellowish.

The caps of my specimen were overlapping, all sprouting from what might be called a (very) rudimentary stalk.

Aurantiporus fissilis fruits on decaying hardwood in summer and early fall.

Campus distribution and habitat

My Aurantiporus fissilis specimen was found fruiting on dead hardwood, beneath trees, between First Street and Faculty Row. It was collected at 11:00 am on Monday, 10 October, 2011.