Observation 97687: Rhodocollybia badiialba (Murrill) Lennox

When: 2012-06-18

Collection location: MP 7.6 E. Larch Mountain Rd., Multnomah Co., Oregon, USA [Click for map]

Who: Daniel B. Wheeler (Tuberale)

No specimen available

This curious Lentinus was found with multiple sporocarps growing from a single small-diameter Western hemlock stump. First thought it was a Pluteus from the crowded gills. Has a white stem that is solid. White, serrated gills. Cap/Pileus small diameter (to 3 inches=7.54cm) diameter. Never heard of this before, but it keys out to this in Arora. Cap fresh rather reddish, but after a day becoming more brownish with some ruddy highlights.


Growing on hemlock stump. Has white serrated gills. White stipe. No annulus.
Gills adnexed to adnate. Sometimes gills growing together near stipe.
Pileus reddish/brown, with flesh-colored halo near edge.

Proposed Names

44% (2)
Recognized by sight: pileus surface has that “buttery” look to it too
Used references: Douglas
48% (2)
Eye3 Eyes3
Recognized by sight: quite possible

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Have now destroyed Collybia badiialba
By: Daniel B. Wheeler (Tuberale)
2012-06-19 05:55:44 PDT (-0700)

in favor of Rhodocollybia. If nothing else, Collybia badiialba has been deprecated to Rhodocollybia now.

I have this collection drying next to me if anyone wishes to examine the sporocarps.

Only additional point for description is the fine longitudinally white lines on the stipe, especially near the cap. When fresh, stipe completely white and relatively small diameter. Searching for Rhodocollybia, I find longitudinally white lines on the stipe of Roy Halling’s photo for R. badiialba, but the cap color (I know: variable) not nearly red enough, nor the stipe quite right.

Found in what must be considered rainforest conditions. And this year has been very rain-filled, with the wettest April on record, one of the wettest Mays, and already the wettest June on record. Found on a stump: not terrestrial. The stump was Western hemlock. Probably close to 100 feet away from one of the largest Western hemlocks I have ever seen, probably in excess of 200 feet tall and at least 5.5 feet basal diameter.

Residual spore print where I have the collection drying now appears yellowish, or at least yellow tinted to my eye.

Comparison of this collection with other photos from California of Rhodocollybia butyracea and R. badiialba show similarities. But without exception the stipe of this collection is thinner in cross-section. Variation in substrate, maybe? The cap coloration I first considered reddish rather than reddish-brown. Cap color becoming more brown than red in drying.

I have destroyed
By: Daniel B. Wheeler (Tuberale)
2012-06-18 22:11:35 PDT (-0700)

the suggestion of Lentinus/Lentinula, based on lack of pileus scales plus smooth stipe.

The white debris on the cap of one specimen appears to be debris from the surface of the stump that the mushroom was growing out of. There were, as I recall about 7 mushrooms growing from a stump approximately 8 inches in diameter and perhaps 5 inches above the ground.

Possibly abused.
By: Daniel B. Wheeler (Tuberale)
2012-06-18 22:06:03 PDT (-0700)

But the last 2 photos are of 2 separate specimens.

I agree
By: Danny Newman (myxomop)
2012-06-18 18:03:43 PDT (-0700)

more wavy, and possibly just on account of being abused and a bit dry.

More photos of gills added.
By: Daniel B. Wheeler (Tuberale)
2012-06-18 17:38:31 PDT (-0700)

Not serrated in the sense of Lentinulla.

By: Douglas Smith (douglas)
2012-06-18 12:58:05 PDT (-0700)

Looks more like a Rhodocollybia, and some of those species have finely serrate edges. The gills here are too thick and close, and it doesn’t look like the gills have that characteristic decurrent tooth of the species. But that is hard to tell from the photos.

Also, it has been reported that N. kauffmanii is only found on Sitka spruce.

By: Danny Newman (myxomop)
2012-06-18 12:44:25 PDT (-0700)

your photo resolution is too low to tell if the gill edges are serrate. please upload larger images if possible.

Created: 2012-06-18 12:40:01 PDT (-0700)
Last modified: 2012-10-30 23:58:20 PDT (-0700)
Viewed: 161 times, last viewed: 2018-06-25 15:54:47 PDT (-0700)
Show Log