Observation 25985: Hebeloma (Fr.) P. Kumm.

When: 2009-09-29

Collection location: Southeast Portland, Multnomah Co., Oregon, USA [Click for map]

Who: Daniel B. Wheeler (Tuberale)

No specimen available

I had called this Collybia oregonensis in the past, but it cannot be. The most distinctive feature is a strong aroma of lilacs. I found 2 sporocarps today, but have yet to obtain a spore print from them (still early). Cap: 1-2.5 inches wide, cream near edges, usually staining/bruising/zoning darker tan to dark brown and (rarely) black near center of cap; stipe: 3-5 inches long, hollow or with a white core, fibrous, somewhat striate with a silky sheen; gills: dull buff-brown, adnate to slighty adnexed, edged in white; habitat: growing in a well-maintained grassy lawn in a physicians parking lot, always associated near Quercus palustris (Eastern Red oak): not a native species in my area, but quite happy here, and reproducing well.

Not identified in NW Key Council under Collybia or Rhodocollybia (new designation for C. oregonensis). Suspect spore print may be light brown


Proposed Names

-32% (3)
Recognized by sight
-27% (3)
Used references: Arora’s Mushrooms Demystified. Can only call this promising, as I have been unable to find any photos to verify it, and the description has no mention of the white edges on the gills.
62% (2)
Recognized by sight

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

= Observer’s choice
= Current consensus


Add Comment
This collection
By: Daniel B. Wheeler (Tuberale)
2009-10-03 14:22:50 PDT (-0700)

is identical to a better description (26090) made a few days later.

Please see original description.
By: Daniel B. Wheeler (Tuberale)
2009-10-01 09:37:30 PDT (-0700)

The cap is not fibrous at all. The fibrous comment was describing the stipe only.

Inocybe a stretch
By: Douglas Smith (douglas)
2009-10-01 02:39:40 PDT (-0700)

I think you will need some sort of micro-detail to really make sure of an Inocybe. The cap there doesn’t look fibrous enough for me. I would say the cap looks fairly smooth and viscid. With brown spore print this might suggest actually Hebeloma. Most Hebeloma are stinky is some way, where most are radishy or vegetal. I’ve come across some that are fruity. Saying that one is lilac wouldn’t be too much of a stretch. They are microrrhizal and will have an association with some species of tree, which is what you see here.

But that also is just a guess, and some micro-detail will help.

The spore color as brown seems to be just a suggestion here, since you seem to be able to find these, could you get a good spore print, and get s photo of the mushroom with the print in the photo, just to have a good record of the spore color?

Another comment is that if it is Hebeloma, then getting a species is out, since that genus has been porely studied in the US.

Proceeding with Darvin’s suggestion of Inocybe
By: Daniel B. Wheeler (Tuberale)
2009-09-30 08:11:07 PDT (-0700)

went to Arora and tried his key. could be several things. Did not collect base, so cannot confirm what it looks like: usually involved in deep grass. Odor fresh not at all unpleasant, and immiately considered I. suaveolens. Arora’s key states odor of sweet peas: haven’t smelled sweet peas recently, and will consider it. To me smells mostly of fresh lilacs as fresh. As partially dried, smells like old lilacs still, but aroma not as potent. Arora also states I. suaveolens is fairly common in PNW. Many of other possible choices are quickly rejected due to association (always in my experience) with Quercus palustris. While I do extensive mushroom hunting for truffles under Douglas fir and other conifers, I have never found this species associated with conifers.

Went through Arora’s key once again. I. suaveolens seems most likely. Will suggest it.

Spore print: brown and color changes
By: Daniel B. Wheeler (Tuberale)
2009-09-30 07:45:18 PDT (-0700)

Did a spore print overnight on yellow post-it note, turned up barely noticeable, but brown. Also base of both stipes has now turned dark reddish-brown to nearly black, almost like dried blood. Stipe turned very light brown where handled gently on stipe. Odor 1 day after picking still quite strongly of lilacs to me. Yesterday it was somewhat annoying: too strong.