Observation 141868: Russula cystidiosa Murrill
When: 2012-07-30

Notes: Scattered in sandy soil under oak near hemlock along Little River trail, Elkmont,
Pileus: 9mm when young up to 83 mm; 10D7-6, 11D8-E8, 10C5-D6, 10B4, 4A2-5
especially when young, pulvinate when young to infundibuliform when old, depressed,
cuticle is cracked, matt surface that appears minutely pulverent under handlens;
sometimes with darker crustose disc, margin even; context white, average thickness
(7mm in 35 mm tall specimen); no odor, taste piquant to sour mild; spore print D.
Lamellae: cream to dark cream, adnate, occasionally forking at base, breaking at base,
average to broad when mature; guaiac .
Stipe: 18-39mm; white with 9A4-3 hue, smooth to occasionally with bumpy reticulations,
equal, enlarged at apex; context solid, white, spongy; guaiac -, FeSO4 pink on context
Spores: (9.5
)9.2-8.6-8.1(-7.5) × (7.9-)7.7-7.2-6.7(-6.4) µm, Q= (1.31-)1.24-1.2-1.16, amyloid plage; ornamentation (1.5 )1.3-1.1-0.9 µm, mostly isolated warts with acute apex, a few connectives (up to 2), Pseudocystidia: pleurocystidia SV + (gill edge not changing though cystidia present), abundant, oil-filled, cylindrical, (83)78-71-64(-58) × (13.8-)13.6-12.3-11(-10.2) µm
Pileipellis: Orthochromatic in cresyl blue, pellis is an ixoderm of multi-septate hyphae with acute ends, occasionally protruding past gel; dermatocystidia abundant, SV +, clavate, usually extending only partly through cutis

Proposed Names

55% (1)
Eye3 Eyes3
Used references: Kibby & Fatto key

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
No one has commented yet.

Created: 2013-08-05 16:38:22 CDT (-0400)
Last modified: 2013-08-05 16:38:30 CDT (-0400)
Viewed: 49 times, last viewed: 2016-10-27 19:04:43 CDT (-0400)
Show Log