Notes: CFS-31Jan2009-1 Leptonia sp.
Subgenus Cyanula, Section Caesicaules, Series Caesicaules; near the
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.
Close-up of stipe apex and gills (not inconsistently marginate lamellae).
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sum(score * weight) /
(total weight + 1)
Created: 2009-02-04 13:23:05 PST (-0800)
Last modified: 2015-03-11 10:57:38 PDT (-0700)
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