Observation 279736: Biannulariaceae Jülich

Growing from the side of a mossy, decorticated hardwood log. Ulmus sp., Acer saccharum, Fagus grandifolia, Carya ovata and Quercus sect. Lobatae nearby. 5 basidiocarps present with 2 of them being primordia. Gills very finely adnexed. Veil absent. Cap and stem smooth. Odor indistinct. Spore print white. GPS coordinates are not exact but it was found nearby.

Basidiocarp measurements for the 3 (relatively) mature basidiocarps:

1: Cap 0.8 cm wide; stem 0.9 cm long; stem 0.2 cm wide.
2: Cap 0.7 cm wide; stem 0.9 cm long; stem 0.1 cm wide.
3: Cap 0.4 cm wide; stem 1.0 cm long; stem 0.1 cm wide.

Species Lists


2017-06-11-01.29.59 ZS PMaxcrop.jpg
Habitat. The log in the front center was the one this was growing on.

Proposed Names

-86% (1)
Used references: Largent, D. L., & Baroni, T. J. (1988). How to Identify Mushrooms to Genus VI: The Modern Genera (Vol. 6). Mad River PressInc.
-29% (1)
Recognized by sight: Closest blast results all in this family
-4% (2)
Recognized by sight: If “Clitocybe aff. fellea” is added to that genus
-29% (1)
Recognized by sight: Some species are not too distant ITS matches. More likely Pseudolaccaria or an unamed related genus though IMO.
57% (1)
Recognized by sight: Senior synonym of Catathelasmataceae
29% (1)
Recognized by sight

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= Observer’s choice
= Current consensus


Add Comment
Email response from Brandon Matheny
By: Django Grootmyers (heelsplitter)
2017-10-03 11:02:22 CDT (-0400)

Hi Django, Thanks for sharing this. It’s not something I’m working on, but I would like to know what it does turn out to be. I don’t think it’s a Pleurocollybia because of the centrally attached stipe and the thick distant lamellae. However, one should compare it with those species provided in Baroni’s 2008 Mycotaxon paper that includes a key to Pleurocollbyia. Bear in mind this genus is not monophyletic as P. cibaria is a species of Gerhardtia in the Lyophyllaceae. The species also does not appear to be a Pseudolaccaria, although it resembles this genus; the phylogenetic work does not support Pseudolaccaria as a placement.

Get MO to change Catathelasmataceae to Biannulariaceae. The latter has priority by a few years.

If you’d like to send the specimens to us, that would be great. I’d accession them into our herbarium.

Also, try running it through Bigelow again (or even Kauffman’s Agaricaeae key), but bear in mind the pileus is not really white; it’s more a pinkish buff with a white canescent covering that looks to become light brown (the latter based on your photos).

Nice find.


Pleurocollybia cremea
By: Django Grootmyers (heelsplitter)
2017-09-28 14:16:35 CDT (-0400)

Seems to be the closest Pleurocollybia to this (central stem, completely white) based on my review of the literature but it’s only known from New Zealand.

Here’s Renee Lebeuf’s picture of the same taxon
By: Django Grootmyers (heelsplitter)
2017-09-28 01:45:15 CDT (-0400)
Probably an overstatement
By: Django Grootmyers (heelsplitter)
2017-09-27 18:08:09 CDT (-0400)

I do think microscopy would be useful here.

I honestly don’t think microscopy would even help that much here
By: Django Grootmyers (heelsplitter)
2017-09-27 16:09:02 CDT (-0400)

But I may get around to doing it on some of my other collections of this. This is almost certainly the same species being called “Clitocybe aff. fellea” on Genbank. By Matheny IIRC. I checked that out in the Bigelow Clitocybe monograph and it seems to be pretty close to that macroscopically although there seems to be a lot of confusion about what that species actually is. Other than that, Vizzini’s paper naming Pseudolaccaria and some of the literature on Pleurocollybia would be worth looking into. Maybe also “The Agaricales in Modern Taxonomy, 4th edition” for the hell of it. I may email Brandon Matheny and Renee Lebeuf about the genbank sequences and see what they think. It may be that someone ia currently working on this.

It seems to be pretty common on hardwood logs in the Midwest. Maybe also the Northeast in general based on the genbank sequences.

By: Alan Rockefeller (Alan Rockefeller)
2017-09-27 15:59:11 CDT (-0400)

Microscopy is needed at this point, the relevant literature is likely obscure though so interpreting it might be hard. Also it would be useful to see where it falls with ef1-a sequences.

LSU does not seem to have any more reference data around this group.
By: Stephen Russell (Mycota)
2017-09-27 15:39:33 CDT (-0400)
Check LSU
By: Alan Rockefeller (Alan Rockefeller)
2017-09-27 14:54:46 CDT (-0400)

Might give a different or better answer than ITS.

I will follow your lead.
By: Stephen Russell (Mycota)
2017-09-27 11:21:54 CDT (-0400)

I have at least two collections of this species from Indiana.


Created: 2017-06-23 20:24:24 CDT (-0400)
Last modified: 2017-12-25 16:19:25 CST (-0500)
Viewed: 237 times, last viewed: 2019-08-23 03:21:10 CDT (-0400)
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