Observation 17589: Leptonia subviduense
When: 2009-01-31
Herbarium specimen reported

Notes: CFS-31Jan2009-1 Leptonia sp.

Subgenus Cyanula, Section Caesicaules, Series Caesicaules; near the
subviduense complex.

Collected 31 Jan 2009, Mendocino County, California, USA

Cap: 31.6 mm wide, 13.8 mm high. Appressed-fibrillose, broadly convex, margin slightly inrolled and wavy. Deep midnight blue-black. Small umbo (papillate). Flesh 1.6 mm thick at disc. Dingy-white flesh.
Lamellae: 12-16 mm long, 4.2-7 mm deep. Pallid creamy-tan or flesh-colored, quite blue-gray near the stipe, somewhat marginate along the inner 1/2 of some of the larger lamellae. Approximately equal depths. Mostly straight to slightly wavy.
Stipe: 58.7 mm tall. 3.7 mm thick at apex, 3.6 mm thick at lowest point. Medium blue-gray, quite a bit lighter than cap. Glabrous except for distinct scurfs at apex. Striate at base, with distinct mycelial bulb at base – 7.6 mm thick.
Odor: (After 2 days of storage in a tacklebox) – faintly fragrant-pungent or indistinct.
Spores: (10-13.5) 12.1 μm x 6.9 (5.7-7.7) μm, 5-6 sided, heterodiametric.
Pileipellis: Trichodermium, entangled elements (collapsed ?) periclinal at disc, erect away from disc (this seems the opposite of the usual to me).
Stipitipellis: With tufts of cylindrical-clavate caulocystidia.
Cheilocystidia: Collapsed, not abundant, cylindrical-clavate to subcapitate.
Pleurocystidia: Scattered, cyclindrico-clavate, approximately 25 μm tall.
Clamp connections: Absent in all tissues examined (pilepellis, lamellae, stipe, mycelium at base of stipe)

These species can be eliminated by AT LEAST the indicated characteristic (and usually many others):
parva: different pilepellis and pileus color
yatesii: decurrent lamellae
viridiflavipes: color of stipe base, clustered habit
chalybea: basal mycelium scarce to absent, stipe “perfectly” glabrous, pilepellis a palisade
decolorans f. atropruinosipes: stipe covered in dark squamules
decolorans f. decolorans: glabrous stipe
decolorans f. cystidiosa: lacks pleurocystidia, different pilepellis

The L. subviduense group is close but the varieties differ at least in these characteristics:

var. subviduense: Lamellae most often with a decurrent tooth, rarely pruinose at apex, stipe quite fragile, smaller spores.
var. marginata: Cheilocystidia abundant – originate as elements of pileal margin when young and thus identical to pileocystidia, gills serrulate, strongly marginate, stipe “extremely fragile”.

Specimen at UCSC Gilbert Lab.

Species Lists


Copyright © 2009 Christian F. Schwarz
Pileus, stipe, basal mycelium, stature.
Copyright © 2009 Christian F. Schwarz
Gills, stipe, basal mycelium.
Copyright © 2009 Christian F. Schwarz
Close-up of stipe apex and gills (not inconsistently marginate lamellae).
Copyright © 2009 Christian F. Schwarz
Cross section of basidiome.
Copyright © 2009 Christian F. Schwarz
Pileipellis at disc (400x).
Copyright © 2009 Christian F. Schwarz
Spores (1000x).
Copyright © 2009 Christian F. Schwarz
Stipitipellis at apex (400x).
Copyright © 2009 Christian F. Schwarz
Pilepellis away from disc (400x).
Copyright © 2009 Christian F. Schwarz
Cheilocystidia at (400x).

Proposed Names

57% (1)
Eye3 Eyes3
Recognized by sight
Used references: The Entolomataceae of the Western United States and Alaska (Largent 1994)
Based on microscopic features: See description.

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

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Christian (Christian Schwarz)
2009-02-04 13:50:07 PST (-0800)

I e-mailed my work to Largent, his opinion is (hopefully) forthcoming.

Created: 2009-02-04 13:23:05 PST (-0800)
Last modified: 2015-03-11 10:57:38 PDT (-0700)
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