Kaernefeltia merrillii (Du Rietz) A. Thell & Goward 1996 — Overview

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 Thallus: foliose, rarely subfruticose, decumbent; lobes: rather broad to narrow, c. 0.5-11.0 mm wide; apices: rounded to fusiform, eciliate; upper surface: olive-brown to greenish black, rough and occasionally ridged or foveolate, usually dull, occasionally pruinose; isidia: sometimes present, flattened; soralia and lobules: absent; pseudocyphellae: sparse, indistinct, immersed; cortex: strongly white, prosoplechtenchymatous; medulla: white, loosely packed; photobiont: a Trebouxia; lower surface: pale brown, attached by simple, black rhizines; Apothecia: frequent, marginal to laminal on thallus, at first concave, later becoming convex, pedicellate; margin: prominent, with thalloid rim; disc: imperforate, dark olivaceous brown; exciple: hyaline; epithecium: brown or brownish yellow; hypothecium: hyaline; asci: clavate, lecanoral, 8-spored; ascospores: simple, ellipsoid to broadly ellipsoid, 6-10.5 x 2.5-5 micrometer; walls: thin, hyaline, not amyloid; Pycnidia: laminal or marginal, immersed or emergent and sessile; conidia: bifusiform, 5-7 x 1 micrometer; Spot tests: all negative; Secondary metabolites: cortex with an unknown pigment, medulla with lichesterinic and protolichesterinic acids and 2-3 other low-Rf fatty acids.; Substrate and ecology: bark or wood; World distribution: temperate/boreal areas of western North America from low altitudes to alpine areas and at intermediate altitudes in central Spain; Sonoran distribution: chaarral areas of Baja California and southern California. 


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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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