Observation 6974: Polyporus decurrens Underwood

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.

Proposed Names

63% (3)
Eye3 Eyes3
Used references: Mushrooms Demystified

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
P. decurrens vs P. tuberaster
By: Darvin DeShazer (darv)
2008-03-07 04:36:24 CET (+0100)

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)
2008-03-07 04:10:37 CET (+0100)

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 06:00:47 CET (+0100)

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.

Created: 2008-03-06 02:04:35 CET (+0100)
Last modified: 2008-03-06 02:04:35 CET (+0100)
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