When: 2003-12-31

Collection location: Point Reyes National Seashore, Marin Co., California, USA [Click for map]

Who: Ron Pastorino (Ronpast)

No specimen available

These were growing on a dead branch above ground which should eliminate Polyporus tuberaster. The spores seem to be cylindrical, smooth and about the right size for the P. decurrens per MD.

Species Lists


Proposed Names

63% (3)
Used references: Mushrooms Demystified

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= Observer’s choice
= Current consensus


Add Comment
P. decurrens vs P. tuberaster
By: Darvin DeShazer (darv)
2008-03-06 22:36:24 CST (-0500)

One cleaver way to arrive at a conclusion is to return to the site with a shovel and see if a sclerotium is buried there….

P. decurrens vs P. tuberaster
By: Ron Pastorino (Ronpast)
2008-03-06 22:10:37 CST (-0500)

Well, I’m willing to bow to the experts here and change this to P. tuberaster. However, these were growing completely off the ground right on a branch that was well off the ground. The general appearance of the cap and pores and the spores seem very similar, but the total lack of a visible connection to an underground sclerotium except possibly along a long path through a dead branch seems odd. It would be interesting to know how Gilbertson arrived at his conclusions. I guess today DNA analysis would have the last word on that.

Polyporus tuberaster
By: Darvin DeShazer (darv)
2008-03-06 00:00:47 CST (-0500)

Gilbertson & Ryvarden, 1987, list P decurrens as a synonym of P. tuberaster. They note that when it is growing on wood, there is often a connection through the wood to an underground sclerotium.

Gilbertson, R. L. and L. Ryvarden. 1987. North American Polypores Vol. II. Fungiflora, Oslo, Norway. 885p.