Observation 146000: Bothia castanella (Peck) Halling, Baroni, Binder
When: 2013-09-19
No herbarium specimen
0 Sequences

Birch, maple, beech.
Old faded specimen with dull yellow pores. Odor fairly weak, but musty. Growing together with stipes touching. I think old specimens of innixus may possibly be confused with subtomentosus, auriporus, or spadiceus. But those types have larger spores.

Proposed Names

21% (2)
Recognized by sight
Based on microscopic features: Spores smaller than 11 mu long, many smaller than 10 mu.
-34% (2)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
I recently walked the trail…
By: Dave W (Dave W)
2014-11-16 09:41:58 CST (-0600)

where these were collected. There are a few oaks scattered around the mainly birch/beech/maple/hemlock/ash forest.

Basal mycelium
By: I. G. Safonov (IGSafonov)
2013-09-22 21:00:45 CDT (-0500)

The color of the basal mycelium in the top photo appears to be white. B-R-B and other sources say it’s yellow for B. innixus. At the same time, I am still not entirely convinced it’s Bothia — of the five points listed by Dave #4 definitely works against it. Perhaps we should also consider Boletus L. for the time being.

I don’t think these are Bothia.
By: Dave W (Dave W)
2013-09-22 20:13:31 CDT (-0500)

I am familiar with B. castanellus, although I haven’t made many collections of it. Mainly I have seen it south of the Pocono Plateau. But I believe I may offer a few reasons to support my doubt about Bothia.
1. The area where these were collected is devoid of oak. Birch, maple, some hemlock, and possibly hickory were the dominant tree types.
2. These mushrooms had clearly fruited at least several days prior to the observation; weather very dry last week. In my limited experience with Bothia, the cap becomes somewhat concave in age… at least almost flat. These caps are convex.
3. Cap surface not tomentose. But maybe this is not important. B/R/B says Bothia caps become glabrous in age.
4. Although the pores are large and lamellate near the stipe, they lack the radial allignment which I associate with Bothia. Actually, for Bothia that has been around for awhile I’d expect the pores to be larger than the ones seen here.
5. The Bothia I have found had soft context in the cap. These had fairly firm context in the caps.

I think these are B. innixus that has become somewhat atypical in appearance due to the dry weather. Interestingly, B/R/B report that Xerocomus castanellus was a name once applied to Bothia. Although I am not convinced these are Bothia, the proposal certainly causes me to consider this suggestion and to view my innixus proposal with a bit of doubt.

Forgot to include in the original post, KOH quickly mahagony on cap surface and not changing color after that.

By: Christian (Christian Schwarz)
2013-09-22 18:50:25 CDT (-0500)

the decurrent tubes and colors overall look like Bothia

Dave, the top photo
By: walt sturgeon (Mycowalt)
2013-09-22 17:06:47 CDT (-0500)

looks very much like Bothia castanella which is a species I know you are familiar with.

Hello, Dave…
By: I. G. Safonov (IGSafonov)
2013-09-22 14:59:32 CDT (-0500)

Looking at the 2nd from the top picture (pale pore surface color, angular & compound pores typical of “xerocomoid” boletes and longitudinal ridges at the apex characteristic of illudens_/spadiceus_/subtomentosus) and before reading your notes, I wasn’t so sure about your ID. However, after carefully examining the “evidence”, I now agree with you. The spore size, the exposed flesh staining pink, the caespitose stipes with a bulbous base terminating in a small root — they all point to B. innixus.

Created: 2013-09-20 08:15:12 CDT (-0500)
Last modified: 2014-11-16 10:33:26 CST (-0600)
Viewed: 91 times, last viewed: 2017-11-19 18:31:56 CST (-0600)
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