Observation 25900: Hebeloma (Fr.) P. Kumm.

Associated with Quercus palustris at the Grove of the States. An interesting locale: all the state trees (and many protectorates) are found here. For me, positive identification requires odor: fungus smells like lilacs. Spore print dark brown. Base of stipe where pinched becomes dark brown to black over 48 hours. Cap can dessicate to shades of dark red-brown as well.

[admin – Sat Aug 14 02:01:21 +0000 2010]: Changed location name from ‘I-5 Rest area south of Wilsonville, Oregon’ to ‘I-5 Rest Area, near Wilsonville, Oregon, USA’


Proposed Names

28% (1)
Recognized by sight
45% (2)
Used references: Another collection of same mushroom, currently considered Hebeloma. Spore print for other collection has dark-brown spore print.

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= Observer’s choice
= Current consensus


Add Comment
I have collected H. crustuliniforme
By: Daniel B. Wheeler (Tuberale)
2009-10-02 16:56:30 CDT (-0400)

and this isn’t it. It fruits during a wide portion of the year, whenever sufficient water is available. My particular patch is well-watered next to a physician’s office, and gets 1" every week, at least. However, unlike H. crustuliniforme, this species gets to a maximum cap size of 2.5cm, and is frequently much less than that. H. crustuliniforme often reaches 3-5 inches in my area.

Additional collections
By: Daniel B. Wheeler (Tuberale)
2009-10-02 10:20:09 CDT (-0400)

of same fungi prove dark brown spore print of young material, no annulus noted, flesh of both cap and lower stipe bruise dull reddish-brown on bruising over 48 hours. Hebeloma currently being considered.

Not Rhodocollybia oregonensis
By: Daniel B. Wheeler (Tuberale)
2009-09-29 05:42:17 CDT (-0400)

as described in the NW Key Council, at the very least. Some additional information: I have never taken a spore-print on this. Gill coloration changes with weather conditions, but usually pallid to buff-tinted white; ALWAYS found with Quercus palustra, which in Portland is an ornamental introduced species. I think I used MD to key this out before. In Key Council description R. oregonensis should have an almond-like odor. Not to me.

That still begs the answer: what is it? Our mushroom season is just now beginning, so should see more material in local lawns shortly. Will take spore print and report. Until then, I think it safe to conclude this is an Agaricales.

Something else…
By: Douglas Smith (douglas)
2009-09-28 04:06:15 CDT (-0400)

This doesn’t really look like R. oregonensis. That species has a brown to brick red top, dense white gills, long fibrous stipe somewhat radicating, growth on conifer debris, and an intense odor of almonds. There is a ref. here:


With a photo.

With the odor of lilacs, it is something else. Not sure what, have you checked on the spore color here? Is it white, off-white?