dcsimg

Description

provided by The lichen genus Psora LifeDesk

Squamules: up to 5 mm diam., more or less isodiametrical, adnate, scattered to contiguous or rarely somewhat imbricate. Upper side: medium brown, dull to shiny, epruinose or partly white pruinose, with a few fissures; margin: white, usually ascending, entire or becoming lobate; underside: pale brown. Upper cortex: 70-130 μm thick, composed of rather thin-walled hyphae with round or ellipsoid to angular lumina, sometimes containing calcium oxalate. Medulla: containing norstictic acid and calcium oxalate. Lower cortex: poorly developed or absent. Apothecia: up to 1.2 mm diam., attached laminally to the squamules, usually simple, strongly convex and immarginate even when young, black, dull, frequently partly white pruinose. Ascospores: 9-13 x 5-7 μm. Pycnoconidia: 5-7 x 1 μm. Thallus chemistry: norstictic acid.

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Timdal, Einar
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Timdal, Einar

Diagnostic Description

provided by The lichen genus Psora LifeDesk

The species may mainly be confused with some terricolous forms of P. himalayana and P. tenuifolia, see these species for discussion.

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Timdal, Einar
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Timdal, Einar

Distribution

provided by The lichen genus Psora LifeDesk

Asia, Europe, northern Africa, and North America.

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Timdal, Einar
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Timdal, Einar

Habitat

provided by The lichen genus Psora LifeDesk

On calciferous soil or in crevices of rock in open habitats.

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Timdal, Einar
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Timdal, Einar

Look Alikes

provided by The lichen genus Psora LifeDesk

Psora himalayana, Psora tenuifolia.

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cc-by-nc
copyright
Timdal, Einar
author
Timdal, Einar