Observation 146797: Leccinum holopus (Rostk.) Watling
When: 2013-09-29
No herbarium specimen

Notes: Birch woods near a wetland.

Second photo shows mushroom that has just been sliced. Third photo after several minutes. Fourth photo is a differenr specimen.

I see that “Leccinum holopus var. americanus” is depreciated. Have the staining and non-staining holopus now been lumped?

Proposed Names

86% (1)
Eye3 Eyes3
Recognized by sight: Pink staining with grayish streaks/areas.

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Eye3 = Observer’s choice
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There’s another area where I have IDed collections…
By: Dave W (Dave W)
2013-09-30 19:15:41 EDT (-0400)

as L. holopus var. americanus. The day before this collection was brought home, my wife brought home a collection form this other spot… virtually identical habitat and virtually identical elevation asl (spots are about 2 miles apart as the crow flies). The two collections were clearly the same type.

Here’s a collection made form the other site, last year same time of year.
This older collection shows the pale caps I’d expect with holopus. Staining pattern is the same as what is seen in the currently featured obs (146797). I believe the two collections (featured and linked) show the same species. KOH info from last year’s collection actually matches B/R/B record of holopus var. holopus. So this would appear to support the hypothesis (see Kuo) that the two varieties should be lumped.

Habitat (both collection sites): gray brich and some small spruce (probably a native type). This habitat matches the expectation for L. oxydabile. But B/R/B specifically points out that, although oxydabile stains pink, it does not exhibit any gray/black staining. Both observations discussed above show the gray/black staining.

I think the aerolate appearance and color of the caps is the result of 8 consecutive days of almost total sunshine (no rainfall). The color is a bit rich, but B/R/B inlcudes “vinaceous buff, occasionally with gray, buff, tan, or pinkish tints.” I believe these caps show color consistent with this broad expectation.

I’ll probably visit one of these two spots during the next week or so, and I’ll sacrifice a couple specimens for more study. (As one can see with the sectioned specimen, this featured collection made a nice side dish at dinnertime :-)

No I haven’t…
By: Dave W (Dave W)
2013-09-30 14:10:27 EDT (-0400)

considered oxydabile. It’s a name I just haven’t really incorporated into my mind yet. But I think I should try to learn about this species, and perhaps this is a start. There are a few traits common to the type seen here that do not remind me of holopus collections made in other areas. First, the cap color/texture looks a bit different than other “holopus” collections. Second, at least some of my holopus collections have context that is fairly soft. The ones seen in this obs have firm context. Third, holopus I have collected in other areas can grow to be quite tall. The type seen here typically tops out at about 4 or so inches in height.

By: I. G. Safonov (IGSafonov)
2013-09-30 00:20:47 EDT (-0400)

Have you considered L. oxydabile?

Created: 2013-09-29 23:09:19 EDT (-0400)
Last modified: 2013-10-23 21:18:24 EDT (-0400)
Viewed: 148 times, last viewed: 2016-10-26 06:04:48 EDT (-0400)
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