Notes:
Same area and possibly same species as Obs 377378 (and Obs 423678, same location about 1 year after this collection); Three small carpophores fruiting within 15 sq feet of each other (two clustered and the third solitary), following a period of light, consistent rain, within mixed pine woods, right off of a somewhat ‘beaten path’; Macro: Basidiomes slender, fragile and dainty, resembling Leucoagaricus species from a quick glance; Pileus fragile, 1.5 to 2.0 cm broad, convex to campanulate when young and nearly plane-applanate upon maturity, white but constrasted by vinaceous-purple-burgundy fibrils with splashes of olivaceous-yellowish tones on the disc, dense and more appressed at disc becoming sparse towards margin, the fibrils towards margin becoming more of a light brown in age, margin appendiculate with veil remnants, diminishing (but still present) when mature, slightly bruising yellowish when rubbed/damaged, drying a pale brownish-rusty orange color; Lamellae free, sub-crowded to crowded, initially white when young, becoming pale pinkish-grey, then ultimately a darker greyish-brown (almost black when dry/mature), lamellulae present and of various lengths, gills appearing to bruise slightly darker when damaged; Stipe about 3 to 4 mm wide, equal about 3/4 of stipe, flaring towards slightly bulbous/enlarged base, white, smooth above annulus, slightly fibrillose below, quickly bruising deep yellow to gold when handled/bruised, fibrils also changing when handled, hollow to stuffed, drying a very deep golden-orange color when dried, Annulus scant, membranous, diminishing in maturity; Odor/Taste odor nondistinctive, did not taste; Chemical Reaction KOH yellow on pileus/flesh; greenish on gills (believe it was spores turning green); Micro: Basidiospores brownish, somewhat thick-walled, ellipsoid, dextrinoid, greenish-blue-grey in KOH, ~ (4.3) 4.4 – 5.1 (5.2 – 5.5) x (2.5) 2.8 – 3.3 (3.5) μm; Q = 1.32 – 1.82; N = 90; (95% Conf: L x W = 4.77 – 4.88 × 3.0 – 3.06 μm; Q = 1.58 – 1.62); Basidia mostly 4-spored (infrequently 2-spored), clavate, hyaline, ~ 14.0 – 22.5 × 5.0 – 7.0 μm; Q = 2.14 – 3.45; N = 32; (95% Conf: L x W = 16.71 – 17.96 × 6.1 – 6.47 μm; Q = 2.67 – 2.87); Pleurocystidia absent/not observed; Cheilocystidia mostly broadly clavate, to ovoid/subglobose or pyriform, collapsing very easily, hyaline or filled with yellowish contents, hard to make out, ~ 19.0 – 25.0 x (9.0) 11.0 – 13.0 μm; Q = 1.7 – 2.5; N = 8; (95% Conf: L x W = 20.2 – 23.2 × 10.5 – 12.0 μm; Q = 1.7 – 2.2); Lamellar trama mostly irregular, oleiiferous hyphae observed; Pileipellis consisting of a cutis, entangled cylindrical elements, with areas of perpendicular hyphae resembling a trichoderm, septate (constricted at most septa), pale brownish grey to hyaline, up to 13.5 μm wide, but mostly 7 – 9.5 μm; Pileal trama entangled hyphae, appearing golden yellowish-green in KOH, some hyphae containing refractive contents, mostly hyaline, oleiiferous hyphae observed; Clamp Connections not observed in any hyphae/tissue.

Images

Spores in Melzer’s
Spores in water
Spores in KOH
Cheilocystidia
Cheilocystidia
Cheilocystidia
Cheilocystidia
Cheilocystidium
Spores in KOH
Top view of cheilocystidida
Pileus hyphae in KOH
Cheilocystidia
Spores in Melzer’s
Pileipellis
Pileipellis
Pileipellis
Pileipellis
Pileipellis – 400x
Lamellar trama

Proposed Names

-57% (1)
Based on chemical features: KOH somewhat greenish on cap context; KOH turning some hyphae greenish/turquoise.
29% (1)
Recognized by sight
-57% (1)
Recognized by sight: General macro
Based on microscopic features: Dextrinoid spores
Based on chemical features
29% (1)
Recognized by sight

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= Observer’s choice
= Current consensus

Comments

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Also,
By: Chris Cassidy (cmcassidy)
2019-08-11 09:37:33 CDT (-0500)

I’ve been reading through Kerrigan’s text, and also A few excerpts from Parra (2013), and have seen some very similar looking Agaricus sect. Minores species from the tropics and Carribean region. Lots of undescribed taxa, so likely hard to deduce this one down to a species

Looks so very similar to
By: Chris Cassidy (cmcassidy)
2019-08-10 22:54:18 CDT (-0500)

Created: 2019-08-10 18:44:43 CDT (-0500)
Last modified: 2020-09-10 09:12:17 CDT (-0500)
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