prl12120a prl12120b prl12120c

Perenniporia robiniophila (Murrill) Ryvarden

Mycotaxon 17: 517 (1983)

Uncommon name:
locust polypore
Descriptions don't say whether it is annual or perennial. The one outside the Field Museum could be said to be perennial as the second year growth surrounded the lower part and extended upon the first year growth. But the second year pore layer was separated by a large amount of context from the first year pore layer above it.
Similar species:
The other pileate Perenniporia have a more colored upper surface, or develop a dark crust, or are much thinner or smaller.
Heart rot of hardwoods. Typically on Robinia (locust) but Overbolts reported that it seemingly was best developed on Celtis (hackberry).
Perennial brackets can be found year-round.
Widespread across eastern North America. This is an American species not seen in Europe. Ryvarden (1983) reported it for India and Pakistan. It is on a 2012 checklist of the polypores from Liaoning Province, China.
Chicago Region status:
Rare. There are no known historic records for Chicago. Elsewhere in Illinois it was found at Fox Ridge State Park in 1990 (A.S. Methven and K. Cecil).
Our first Chicago record was on old-growth hackberry outside the east door of the Field Museum. Leacock collected it in 2013 but did not identify it until it was better developed in 2014 and recollected. It became more extensive on the base of the tree in 2015, and then fruited in more places on base of trunk in 2016. In summer 2016 the tree was noticeably stressed with the foliage thinner in the crown and the leaves paler green than the neighbouring hackberry trees. In early August the city removed all but the trunk (prior to Aug 12). Patrick made another collection; the fresh brackets failed to give a spore print. Coincidently, this was the same week that Michael Kuo posted his web page on this species (photos at his link below).
Collected at Falls Church, Virginia, on decayed spots in living trunks of Robinia pseudoacacia (black locust), July 11, 1904, W. A. Murrill. [but the NY photo of the type specimen label shows "Aug. 1901"]
Index Fungorum is in error listing the current name as Trametes.
Specimens examined:
First record was P.R. Leacock 11105 (November 2013); repeated collections with the last being PRL 13046 (August 2016).
Description links:
Michael Kuo. Gary Emberger. Ryvarden (1983).
Records online:
Mushroom Observer ; MycoPortal
Taxon links:
109165 MycoBank ; Index Fungorum ; Species Fungorum