Overview

Brief Summary

Description

 Thallus: umbilicate, usually monophyllous, +circular, rigid, 1-3(-6) cm in diam.; upper surface: medium to dark brown, smooth to strongly verrucose; medulla: white; lower surface: pale brown to almost black, often with cavities; Apothecia: common, black, adnate to sessile, gyrose, up to 2 mm in diam.; asci: clavate, 8-spored; ascospores: hyaline, simple, ellipsoid, 8-15 x 4-8 µm; Spot tests: medulla K-, C+ red, KC+ red, P-; Secondary metabolites: gyrophoric, lecanoric and umbilicaric acids.; Substrate and ecology: on siliceous rocks, often on fairly horizontal surfaces on small or larger boulders or cliff outcrops, usually snow-covered in winter; World distribution: Europe, Asia, North America, and Australia; Sonoran distribution: scattered, mostly in the boreal to alpine vegetation zone of the high peaks of Arizona, California, and Baja California.; Notes: Umbilicaria hyperborea is often confused with U. nylanderiana, but the latter species always have single-celled thalloconidia in patches or covering the entire lower surface. 
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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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Comprehensive Description

General Description

Common Name: Blistered Rock Tripe

 

Brown smooth to verrucose umbilicate lichen on exposed rocks with raised black button-like apothecia.

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© Jason Hollinger

Source: Mushroom Observer

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Distribution

National Distribution

Canada

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Northern temperate to boreal and Australia.

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© Jason Hollinger

Source: Mushroom Observer

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Physical Description

Diagnostic Description

UPPER SURFACE: light to dark brown, smooth to strongly verrucose or blistered
 LOWER SURFACE: brown to black, verrucose-papillate
 APOTHECIA: black, roundish, raised or adnate, gyrose
 CHEMISTRY: medulla C+ and KC+ red (gyrophoric, lecanoric and umbilicaric acids)

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© Jason Hollinger

Source: Mushroom Observer

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Look Alikes

Only Umbilicaria species bear any resemblance to this species:

                                  
U. phaea apothecia are sunken or flush with surface and angular, thallus smoother
U. nylanderiana with sooty black patches of single-celled thalloconidia on the otherwise smooth lower surface
U. polyphylla apothecia rare, multi-cellular thalloconidia covering patches of the smooth to papillose lower surface
U. arctica paler lower surface, primarily arctic
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Ecology

Habitat

Exposed siliceous rocks, that often become covered with snow during the winter. Higher elevation in lower latitudes, making it all the way into Mexico.

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Source: Mushroom Observer

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Conservation

Conservation Status

National NatureServe Conservation Status

Canada

Rounded National Status Rank: N5 - Secure

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

Reasons: This lichen species is widespread and is the most common member of the genus in the Pacific Northwest. It occurs throughout the Pacific Northwest except on the coast (McCune and Geiser 1997).

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