Observation 135488: Marasmius cystidiosus (A.H. Sm. & Hesler) Gilliam
When: 2013-06-03
(35.6695° -84.2371° 259m)

Notes: On humus in mixed hardwood forest.

Large collybioid Marasmius.
Pileus-Convex to Plano-convex, 3.0-6.0 cm, rugose, disc tawny brown, and pinkish buff or cream toward margin.
Lamellae- adnexed, close, at first white to buff, then becoming cream-buff in age, edges pruinose.
Stipe- glabrous, 6.0-10.5 cm x 0.3-0.8 cm, more or less equal with white basal mycelium.
Odor- mild, slightly alkaline or raphanoid.
Taste- mild, acidulous or slightly bitter.
Spore Print- White

Microscopic features:
Strongly dextrinoid tramal hyphae, becoming vinaceous red in Melzer’s
Pileipellis- hymeniform, composed of cylindric, clavate, broadly clavate, vesiculose cells 11-38 X 6-20 microns.
Caulocystidia- absent .
Spores- 6.0-9.0 X 3.0-4.5 microns, narrowly elliptical to subcylindrical, slightly inequilateral in profile, hyaline, inamyloid, smooth.
Pleurocystidia- abundant, fusoid or ventricose, inamyloid, refractive, 45-60 × 7-10.0 microns.
Clamps- present

Images

334654
334655
334656
334657
334658
334659
Pleurocystidia abundant, fusoid or ventricose, inamyloid, refractive, 40-70 × 6.5-10.0 microns.
334660
Pleurocystidia abundant, fusoid or ventricose, inamyloid, refractive, 40-70 × 6.5-10.0 microns.
334661
Pileipellis hymeniform, composed of cylindric, clavate, broadly clavate, vesiculose cells 12-36 X 7-18 microns.
334662
Pileipellis hymeniform, composed of cylindric, clavate, broadly clavate, vesiculose cells 12-36 X 7-18 microns.
334663
Pileipellis hymeniform, composed of cylindric, clavate, broadly clavate, vesiculose cells 12-36 X 7-18 microns.
334664
Pileipellis hymeniform, composed of cylindric, clavate, broadly clavate, vesiculose cells 12-36 X 7-18 microns.
334665
strongly dextrinoid tramal hyphae, becoming vinaceous red in Melzer’s
334666
strongly dextrinoid tramal hyphae, becoming vinaceous red in Melzer’s
334667
strongly dextrinoid tramal hyphae, becoming vinaceous red in Melzer’s
334668
strongly dextrinoid tramal hyphae, becoming vinaceous red in Melzer’s
334669
Spores 6.0-9.0 X 3.0-4.5 microns, narrowly elliptical to subcylindrical, slightly inequilateral in profile, hyaline, inamyloid, smooth.
334670
Spores 6.0-9.0 X 3.0-4.5 microns, narrowly elliptical to subcylindrical, slightly inequilateral in profile, hyaline, inamyloid, smooth.
334671
Spores 6.0-9.0 X 3.0-4.5 microns, narrowly elliptical to subcylindrical, slightly inequilateral in profile, hyaline, inamyloid, smooth.
334672
Spores 6.0-9.0 X 3.0-4.5 microns, narrowly elliptical to subcylindrical, slightly inequilateral in profile, hyaline, inamyloid, smooth.

Proposed Names

92% (2)
Eye3 Eyes3
Used references: Desjardin (1989) The Genus Marasmius from the Southern Appalachian Mountains

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2013-06-03 23:40:51 CDT (-0400)
Last modified: 2013-06-04 10:58:14 CDT (-0400)
Viewed: 191 times, last viewed: 2017-06-16 02:16:17 CDT (-0400)
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