Observation 23772: Fomitopsis cajanderi (P. Karst.) Kotl. & Pouzar

When: 2009-07-31

Collection location: Forest near Elgin St., Pembroke, Ontario, Canada [Click for map]

Who: Paul Derbyshire (Twizzler)

No specimen available

Found on wood, probably pine, in Zone 09. (One photo has visible tree rings.)

Third photo is crummy. I wouldn’t have included it, except that it shows a resin drop and neither of the others do.

Fourth through sixth photos are from September 4. These had been growing slowly all summer, as had my skills with the Dark Side of the Force camera. The new photos are high quality, including some detail of the interestingly fused pore surfaces of two of these small (to 1.7cm wide) lilac brackets.

Species Lists


$@&! autofocus
September 4.
September 4.
September 4.
October 2. This observation can now get in the Guinness Book of Records for most species lists. :)

Proposed Names

60% (2)
Recognized by sight: Similar to lilac Fomitopsis on log in Zone 04
57% (1)
Eye3 Eyes3
Recognized by sight: Web images and descriptions of F. cajanderi look more like this, particularly as to size, growth habit, and pinkish rim remaining on top of mature caps. The paler, closer to lilac color also better fits F. cajanderi.

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
I see reddish, not purplish
By: Darvin DeShazer (darv)
2009-09-05 15:39:59 PDT (-0700)

I used your pictures and tried to key it in the only decent book for polypores in North America. It came out to be F. rosea which I have never collected. There are only three listed as having rose-pink or pinkish brown pores. F. cajanderi, F. rosea and a subtropical species on hardwoods, F. feei.
Gilbertson, R. L. and L. Ryvarden. 1986. North American Polypores Vol. 1. Fungiflora, Oslo, Norway. 433p.
Gilbertson, R. L. and L. Ryvarden. 1987. North American Polypores Vol. II. Fungiflora, Oslo, Norway. 885p.

By: Paul Derbyshire (Twizzler)
2009-09-05 15:06:04 PDT (-0700)

http://www.mushroomobserver.org/21513 was also identified as that species, but:

a. Is much larger (3x larger at least)
b. Has a dull brown top instead of lilac, not even a lilac fringe
c. Is solitary while these are gregarious
d. Has a pore color closer to pink than to lilac and
e. Has not got a partially resupinate pore surface.

Five differences by field characters points to these being different (but possibly closely related) species.

Created: 2009-07-31 23:34:05 PDT (-0700)
Last modified: 2009-07-31 23:34:05 PDT (-0700)
Viewed: 186 times, last viewed: 2017-06-05 23:13:42 PDT (-0700)
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