Observation 94613: Lichen P. Micheli
When: 2012-05-02
(47.396° -116.5018° 717m)
Herbarium specimen reported

Notes: Substrate: on soil and/or living or dead moss on top of basalt boulder, The helmet shape of the thallus seems to indicate that it was growing on a clump of either living or dead moss, photo indicates that living moss was righ next to it. Notes say it was growing on moss, b ut underside is all fine light colored soil.

Environmental Conditions: about 1 inch above soil line on rock, rock aspect facing SE, not protected from sun or wind.

Habitat: Prarie, Alluvial Mima Mounds.

Notes: No prothallus. No reproductive features.

Abundance: not abundant, was uncommon in that particular plot.

Photobiont: Green algae coccoid shaped, however a smash mount of the thallus in water on slide created an orange-yellow pigment in the water which seems to indicate the presence of Trentepohlia as either a primary or secondary photobiont.

Granular soredia was abundant in the field and early stages in the lab, nearly absent now after so much playing with it :),

Upper cortex: whitish, turns greenish with water, however making water stay on top and become absorbed is nearly impossible, seems quite hydrophobic.

Underside: lots of very thick rhizines/rhizomorphs, up to 0.7mm thick. The rhizomorphs/rhizines are numerous, long, and connect in numerous areas with the thallus, making the thallus look almost peltate. These rhizines/rhizomorphs extend at least 1mm deep into the soil layer, and lengthier ones seem to connect opposite sides of the thallus, similar to rhizomes in plants.

Herbarium Specimen: stored at Eastern Washington University Herbarium.


in the field, check out the position of the moss. seems to be bryolphilic lichen.
rhizines, making it look almost peltate
photobiont, check out the yellow-orange color.
one of the photobionts isolated
K+red (or maybe thats more purple?)
in the lab
close up of upper cortex
underside, really thick and long rhizomorphs

Proposed Names

28% (1)
Used references: Field Guide to Biological Soil Cursts of the Western U.S. Drylands (Rosentreter et al.) led to A. mastrucata; Lichens of North America (Brodo) led to Lepraria; “Preliminary Key to sterile crusts of North America” (Lendemere) led to Opegrapha moroziana.
Based on chemical features: P=Y, C-(lots of bubbles though!), K=R, KC=ambiguous/-
83% (1)
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Recognized by sight

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Eye3 = Observer’s choice
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Add Comment
Best I can come up with is Aspicilia “simoensis”
By: Jason Hollinger (jason)
2012-06-17 02:39:24 EDT (-0400)

There are very few sterile crusts with K+r reaction, almost all have norstictic acid. (Have you a copy of J. Lendemer’s working key to North American sterile crusts, by the way?) This Aspicilia is a good candidate. Sonoran Flora covers it, too. K. Knudsen once told me it is going to be named A. angelica, I don’t know the current state of that.

Created: 2012-05-13 04:20:05 EDT (-0400)
Last modified: 2012-08-25 02:35:06 EDT (-0400)
Viewed: 63 times, last viewed: 2017-06-13 00:50:55 EDT (-0400)
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