Observation 220769: Porodaedalea gilbertsonii (M.J. Larsen) V. Papp

When: 2015-10-17

Collection location: Skyline Blvd., Redwood City, California, USA [Click for map]

Who: Maria Friedman (yipkiyay)

No specimen available

Growing on Douglas-fir in the San Francisco Peninsula Watershed. This fungus causes a pocketed white rot in conifers and is often found on Douglas-firs. The hymenophore is usually yellow-brown to brown and has a sort-of maze of pores that are very irregular. It is often hoof-shaped but can be more planar.

Microscopically, you will find dark setae sticking out in the pores, characteristic of the Hymenochaetales.

If you see these on a tree near your house or other structure that you like, keep an eye out. It can cause huge losses in structural integrity (and timber value)!


Ungulate fruiting body
Mazoid pores (slightly blurry, sorry!)
Dark setae emerging in the interior of the pores

Proposed Names

19% (2)
Recognized by sight: Ungulate shape, mazoid pores, growing on Douglas-fir
Used references: California Mushrooms, by Desjardin, Wood, & Stevens
Based on microscopic features: Dark setae

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
I guess we don’t have Porodaedalea pini in North America
By: Alan Rockefeller (Alan Rockefeller)
2015-11-03 10:50:25 MST (-0700)

Created: 2015-10-27 12:03:46 MST (-0700)
Last modified: 2017-04-24 12:24:35 MST (-0700)
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