Observation 199620: Phylloporus arenicola A.H. Sm. & Trappe

When: 2015-02-14

Collection location: Roseburg, Douglas Co., Oregon, USA [Click for map]

43.2243° 0.0° 1211m

Who: GreenMyrtle

Specimen available

Cap texture velvety, color olive/brown, margin wavy, little black pockmarks. about 1.5"
Gills: vivid yellow, blunt, with short gills from margin, adnate (appeared broadly attached or could be narrowly attached: hard to tell with stem in poor condition), rubbery (not brittle).
Stem: centered, tapered, about 1.25" long, 0.5" at widest point, scaly appearance (though deteriorating). Discolored reddish/brown

Overall mushroom was very brittle, cap broke clean in 2 and stem broke away with very gentle handling. (However specimen was very wormy and showing signs of age, which probably contributed to fragility). Did not stain blue when bruised.

Location: Open sunny SE facing grassy area, at edge of woods (predominantly cedar, douglas fir, grand fir). Ground very rocky & well drained (sandstone/siltstone I believe) with thin top soil (cliffs to the west, so on millenia of cobble). 12 miles west of Roseburg.

Trees: This mushroom grew on the line where a large White Fir bole had lain on the ground for a couple of years (it died summer 2010, felled fall 2010, left in situ til spring 2013, when we bucked it up. So perhaps the microclimate under the fallen tree for 2.5 yrs got it started. The mushroom was uphill & 15-20ft from the base of the (dead) tree. So it’s not an obvious association with the grand fir. The nearest pine is 300ft away, and there is a large douglas fir tree between the mushroom and that pine, So no pine association.

After realizing how uncommon this is, I went back to retrieve the sample to dry, but it was gone. However I found another partially dried sample (it’s been sunny) lying uprooted on the ground in the same location (definitely not original sample, as it is not broken), but with all gills stripped as if some small creature ate all the gills away. It is the same size, form, coloration, location, but gills stripped clean off. I dried & kept this specemin in my “herbarium”


Phylloporus arenicola cap.jpg
Copyright © 2015 Jenny Council
Cap velvety, Olive green/brown, pockmarked. Brittle.
Phylloporus arenicola gills.jpg
Copyright © 2015 Jenny Council
gills bright yellow, blunt, rubbery. Stem tapered. Decayed fir needles stuck to base.
Phylloporus arenicola in situ.jpg
Copyright © 2015 Jenny Council
where found grass/clover, sunny open area, near fir/cedar treeline

Proposed Names

72% (1)
Eye3 Eyes3
Recognized by sight
Used references

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Daniel B. Wheeler (Tuberale)
2015-02-27 12:01:47 EST (-0500)

are known mycophagists (mushroom eaters) and assist dispersal of spores by moving (slowly) through an area. While Abies concolor (White fir) may have been a host at one time, it would be unlikely in this case considering the time since the White fir had been cut. Truffles are known to fruit from cut host trees up to 2 years after tree death. Western Red cedar does not form mycorrhizae that is currently known, so that host possibility is likely out of the equation. All Phylloporus are mycorrhizal that I am aware of.

Created: 2015-02-23 03:03:17 EST (-0500)
Last modified: 2015-02-24 00:41:09 EST (-0500)
Viewed: 46 times, last viewed: 2017-06-30 07:24:47 EDT (-0400)
Show Log