Observation 336964: Armillaria mellea group

When: 2018-10-05

Collection location: Tillamook State Forest, Tillamook Co., Oregon, USA [Click for map]

Who: Joseph D. Cohen (Joe Cohen)

No specimen available

Notes:
Habitat: mixed conifer forest in Oregon Coast Range; altitude ~ 520 m
Substrate: base of stump of dead conifer
Habit: cluster of several
Taste: indistinct at first, then a mildly bitter, lingering aftertaste
Micro:
Spores: white, inamyloid, smooth

(5.9) 6.3 – 7.8 (8.5) × (4.4) 4.6 – 5.6 (5.8) µm
Q = (1.2) 1.3 – 1.6 (1.7) ; N = 20
Me = 7.2 × 5 µm ; Qe = 1.4

Piximètre 5.9 R 1532 : le 13/10/2018 à 09:10:20.9168810

Other: Stem Length: 25 cm
Stem max diameter: 4 cm

Images

IMG_5297.jpg
MO 336964 unmounted spores 40x.jpg
spores, unmounted, 40X objective
MO 336964 spores Congo Red 100x.jpg
spores, Congo Red, 100x objective

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Comments

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Spore size
By: Joseph D. Cohen (Joe Cohen)
2018-10-13 11:37:50 MDT (-0600)

Spore size (7.2 × 5 µm) is within range given by Arora for A. mellea group. Note different sizes from other North American authors for A. mellea:

spores 6-12 × 5-7 microns, specifically Arora gives 6-10 × 5-6 microns for this group but Bessette gives 8.5-12 × 6-7 microns for Armillaria mellea, (however, Volk gives 7.2-8.9 × 5.6-6.7 microns for A. mellea)

Gibson, Matchmaker: Mushrooms of the Pacific Northwest, Version 2.2.1 (2015) (application, latest version downloadable at http://www.svims.ca/council/matchmaker.htm)

Created: 2018-10-05 09:05:11 MDT (-0600)
Last modified: 2018-10-13 11:37:51 MDT (-0600)
Viewed: 34 times, last viewed: 2019-01-01 10:15:49 MST (-0700)
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