Observation 152692: Suillus Gray
When: 2013-11-16
(39.8143° -74.5479° )
Herbarium specimen reported

Notes: A group of 6 medium-sized specimens growing in sandy soil under pitch pines. Three specimens in best shape have been photographed and preserved. Half of the dried material is in the hands of Dr. Alan E. Bessette.

> The caps are convex to sub-convex and somewhat wavy in shape, ≤6.5 cm in diameter; the margins are non-appendiculate, but possibly with some subtle sterile tissue present(see pix).
> The sticky, glutinous, peelable cuticle is brown to reddish-brown (the flash makes them look orange-brown) in color; areas of the cuticle below clumps of dirt/sand are pale yellow and occasionally streaked with green (see pix).
> The pore surface is brownish-buff, sub-decurrent, transitioning into a scruffy, pale yellow partial reticulum; the pores are small, circular to angular, ~2/mm on average, non-boletinoid and non-radially arranged (see pix).
> The stipes are the most curious feature of this mushroom. It’s pale yellow overall with patchy brownish stains (especially near the base), generally tapering downward and curved at the bottom, and terminating in a pointy, root-like projection; the upper portion (up to 1/3) is covered with raised, scruffy reticulum (one specimen was particularly reticulate, while others were less so) transitioning to minute scruffiness below (see pix); no partial veil/annulus or remnants thereof were present; no glandular dots/smears were observed.

Microscopic observations (documented by Dr. Bessette):
Spores (taken from the dried material) are 8-10(-11) x 3-4 microns (mounting medium unknown). Cystidia are rare, clavate, thin-walled and hyaline. Basidia are hyaline and 4-sterigmate. “Not mush else of significance”.

Macrochemical tests:
KOH = blackish on cuticle; brown on pores; flashing pink and instantly changing to lavender blue on context.
NH4OH = grayish on cuticle, pinkish-orange on pores, pinkish-red on context
FeSO4 = bluish-green on context.
The outcome of these tests is in good agreement with MO #82449. That mushroom, also collected in mid-November (albeit at a different location) and identified as S. brevipes by me, bears some resemblance to this post despite having a much shorter stipe and sporting glandular dots.

rDNA Studies:
The ITS region of rDNA was recently sequenced (711 nucleotides long) by a non-commercial lab in NJ. Alignment of the contiguous composite sequence (supported by both the reverse and forward reads) with the GenBank data yielded two highly similar sequences — both have 99% similarity, with only 1 gap in the same location at the very end of the sequence). The first sequence [Jones,M.D., Phillips,L.A., Treu,R., Ward,V. and Berch,S.M. Agric., Ecosyst. Environ., Appl. Soil Ecol. 60, 29-40 (2012)] was obtained from an environmental sample (a root tip with attached mycelium) and attributed to S. luteus. The second sequence [Kranabetter,J.M., Friesen,J., Gamiet,S. and Kroeger,P. Mycorrhiza 19 (8), 535-548 (2009)] came from a S. brevipes voucher SMI330. In both cases, the studied material was collected in British Columbia!!!

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Created: 2013-11-17 04:59:45 CET (+0100)
Last modified: 2014-02-12 01:08:54 CET (+0100)
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