Observation 12940: Rhizocarpon grande (Flk. in Flot.) Arn.
When: 2008-10-15
Herbarium specimen reported

Notes: Crustose lichen, on granite.
THALLUS: light to medium gray, areolate, areoles thick and strongly convex and (0.38)0.58+/-0.13(0.86) mm (N=17), K-, C-, dull
MEDULLA: white, K-, C+ pink to weakly red, strongly POL+ white clearing in K
ALGAE: algal layer thick and continuous
APOTHECIA: black, lecideine, appear sunken between areoles; rim black, prominant, smooth, shiny, even; disc black, flat to slightly convex, epruinose, to around 0.8 mm; epihymenium black, K+ weakly violet, C-, POL-; hymenium clear, POL-, K-, C-, K/I+ blue; hypothecium dark brown to black; paraphyses strongly conglutinated
SPORES: 8 per ascus, clear when young to dark brown when older, strongly muriform, (30)32+/-2(35) x (15)17+/-1(18) µm (Q=(1.6)1.9+/-0.2(2.1)) (N=9)

Images

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Lecidea in bottom left corner.
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Lecidea in upper right.
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Two little Rhizocarpon amid sea of Lecidea.
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Rhizocarpon off on right side.
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Aspicilia center to left, brown in upper right is Lecidea, and the gray-and-black along bottom to right is Rhizocarpon.
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Mostly Aspicilia, brown is Lecidea, little gray-and-black is Rhizocarpon.
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Areoles, at 30×.
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Apothecial section, in water, at 100×.
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Muriform spores in ascus, in water, at 1000×.
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Immature spores in ascus, in water, at 1000×..

Proposed Names

87% (1)
Eye3 Eyes3
Used references: Nash’s Sonoran Flora
Based on microscopic features: Eight brown muriform spores per ascus.
Based on chemical features: C+ red medulla

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2008-10-20 01:03:21 CDT (-0400)
Last modified: 2008-10-20 01:03:21 CDT (-0400)
Viewed: 24 times, last viewed: 2016-10-26 17:22:01 CDT (-0400)