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Observation 12232: Lecidea diducens Nyl.

On north-facing granite, at around 5000’, on Mt. Wilson Road near top.
THALLUS: endolithic
APOTHECIA: black, scattered; rim slightly prominant, undulate, shiny, smooth, black, thickish, even; disc black, plane, epruinose; exciple dark brown layer outside light brownish-reddish interior, POL+ bright white, C+ red; epihymenium dark green, K-, min POL+ granules descending into hymenium in little tendrils; hymenium light green, K/I+ intense blue obscuring everything; hypothecium brown; asci no way to see K/I stain, thick tip; paraphyses green capped swollen tips, unbranched, strongly conglutinated, not separating in K
SPORES: 8 per ascus, narrowly oblong, one end often a bit thicker, bluntly rounded tips, clear, simple but with two bubbles in every one making them look 2-celled, (14)16+/-1.5(19) x (4.2)4.8+/-0.7(6.5) µm (Q=(2.8)3.5+/-0.6(4.5)) (N=11)


at 30x
apothecial section, in water, at 100x
apothecial section, in C, at 100x
apothecial section, in water, at 100x, cross-polarized
spore, in water, at 1000x

Proposed Names

87% (1)
Used references: Nash’s Sonoran Flora
Based on microscopic features
Based on chemical features

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= Observer’s choice
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