Observation 217658: Leccinum sect. Leccinum

When: 2015-09-26

Collection location: Rush Oak Openings, Rush, New York, USA [Click for map]

42.9596° -77.682°

Who: I. G. Safonov (IGSafonov)

Specimen available

Notes: A single specimen growing in a stand of young big-tooth aspen (Populus grandidentata), intermixed with a bit of black oak, and in the immediate vicinity of obs 217610.

> PILEUS: medium orange with a flap of sterile tissue [this feature places the specimens in Leccinum sect. Leccinum sensu Smith & Thiers]; the cap shape is conical, as opposed to the convex, cushion-like silhouette of obs 217610; the cap slope and pore surface meet at a sharp angle, accentuating the cap edge
> CAP SURFACE: smooth, with very few concolorous fibrils visible
> PORE SURFACE: pale grayish-buff, staining brown upon injury
> STIPE: white background color, with large, black, widely-spaced scabers projecting from the surface; this pattern appears different from the dense pattern of smaller and flatter scabers of obs 217610
> EXPOSED CONTEXT: staining reddish-brown, then brown, then violet, then blackish (see the pix)
> FeSO4 on context = blue

Molecular Data Discussion: A clean 1364 bp nrLSU sequence was obtained for this material. This was compared with the 1440 bp nrLSU sequence of obs 217610, and the overlapping portions were found to be 100% identical.
Conclusion: Despite the apparent subtle morphological differences between this collection and obs 217610, a simple head-to-head comparison of the derived nrLSU sequences indicates the two collections are likely conspecific. At the same time, a BLAST search of these sequences returned many highly similar sequences associated with other red/orange-capped scaber stalk taxa, suggesting that nrLSU is well-conserved in section/subsection of Leccinum and cannot satisfactorily resolve them at the species level.

Species Lists


Photographed <1 min after dissection
Photographed 2 min after dissection
Photograhed 4 min after dissection
Photographed 22 min after dissection; the blue stains on right half of cap are due to FeSO4
Photographed 45 min after dissection; the blue stains on right half of cap are due to FeSO4

Proposed Names

28% (1)
Recognized by sight: Orange cap with marginal flaps; exposed context stains reddish-cinnamon at first
Used references: The Boletes of Michigan by Smith & Thiers
57% (1)
Eye3 Eyes3
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
DNA discussion posted
By: I. G. Safonov (IGSafonov)
2016-03-19 20:10:53 CDT (-0400)

Created: 2015-10-03 21:53:44 CDT (-0400)
Last modified: 2017-11-05 23:38:11 CST (-0500)
Viewed: 84 times, last viewed: 2018-02-10 20:39:22 CST (-0500)
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