Overview

Brief Summary

Description

 Thallus: foliose, forming small rosettes up to 3 cm wide, adnate, lobate; lobes: dorsiventral, flattened to convex, 0.2-0.5 mm wide; tips: rotund to somewhat pointed, often slightly involute, 0.1-0.4 mm wide; upper surface: yellow to orange, smooth to shiny, not sorediate; medulla: white, reticulate, with short hyphae; lower surface: white, smooth or somewhat wrinkled, with short to long, white to yellow rhizines; Apothecia: common, laminal, stipitate, up to 4 mm in diam.; margin: smooth, mostly with short cilia; disc: orange; epihymenium: brown, c. 10 µm thick; hymenium: hyaline below, 60-95 µm tall; paraphyses: simple or branched, cylindrical, septate; hypothecium: hyaline to pale brown, 10-65 µm thick; asci: clavate, 8-spored; ascospores: oblong to ellipsoid, polarilocular, hyaline, 12-17 x 4.5-8 µm; septum: 1-4(-6) µm wide; Pycnidia: common, immersed to protruding, darker than the upper surface; conidia: bacilliform, 2.8-5 x 1-1.5 µm; Spot tests: upper surface K+ purple, C-, KC-, P-; Secondary metabolites: parietin (major), fallacinal (major), emodin, teloschistin (major) and parietinic acid.; Habitat and ecology: on bark, rarely on detritus, often in dry microclimates, such as montane regions; World distribution: temperate regions in North America; Sonoran distribution: Arizona, at intermediate to fairly high elevations.; Notes: The density and length of rhizines and cilia vary considerable in X. montana. Xanthomendoza montana is similar to X. hasseana; see notes for that species for distinctions. Xanthoria polycarpa has more convex and narrower lobes as well as smaller, ellipsoid conidia. 
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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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Distribution

Continental temperate North America (i.e. not coastal).

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© Nathan Wilson

Source: Mushroom Observer

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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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© NatureServe

Source: NatureServe

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Physical Description

Diagnostic Description

Bright orange foliose lichen. Apothecia abundant. Underside pale with abundant rhizines. Pycnidia immersed or protruding, dark.

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© Nathan Wilson

Source: Mushroom Observer

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Look Alikes

X. hasseana is nearly identical, but fortunately has a disjunct range, occuring along the coast, at least in the southwest. Its spores have thicker septum; its rhizines are longer; its lobes are somewhat narrower (according to Lindblom).

 

Some Xanthoria (e.g. X. elegans and X. polycarpa) can look superficially similar, but on close inspection have few or no rhizines (just occasional stubby little things called hapters), while Xanthomendoza montana typically has conspicuous, abundant rhizines.

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© Nathan Wilson

Source: Mushroom Observer

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Ecology

Habitat

Dry bark and woody debris, generally relatively high elevation.

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© Nathan Wilson

Source: Mushroom Observer

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Conservation

Conservation Status

National NatureServe Conservation Status

Canada

Rounded National Status Rank: NU - Unrankable

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: GNR - Not Yet Ranked

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