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Description

 Life habitat: lichenized; Thallus: crustose, areolate to continuous; surface: pale green, pale brown, or yellow (soredia); esorediate or sorediate, lacking isidia; photobiont: primary one a trebouxioid green alga with cells up to 15 µm wide; secondary photobiont absent; Ascomata: apothecial, usually sessile, flat to hemispherical (sub-spherical); disc: chestnut brown, dull to glossy; exciple: reduced, weakly gelatinized, having the same structure as hamathecium; epihymenium: brown, without crystals, pigment sometimes streaking into hymenium; hymenium: hyaline to pale brown, with or without oil drops; paraphyses: moderately to strongly branched and anastomosing, basally colorless, with a distinct dark brown pigment caps; subhymenium and hypothecium: hyaline or patchy brown; asci: a slightly distorted version of the Lecidellatype with an I+ blue tholus and a conical, lighter blue axial body; subglobose to broadly clavate, 8-spored (but reductions frequent); ascospores: hyaline, simple, ellipsoid, ovate-ellipsoid, or globose, thick-walled (2-3-layered); Conidiomata: pycnidial, rare; conidia: hyaline, simple, bacilliform; Secondary metabolites: xanthones and bis-xanthones, and a depsidone (all in J. subaurifera only); Geography: in temperate, boreal, arctic, and antarctic areas; Substrate: bark of trees and shrubs, wood, rock (rarely), and over plant remnants.; Notes: Japewia is characterized by having a crustose thallus, biatorine apothecia with a reduced exciple that resembles the hamathecium, asci +like those of the Lecidella and extremely thick-walled ascospores, that resemble those of Mycoblastus, and conidiogeneous hyphae of type V, which are otherwise common in Parmeliaceae. Mycoblastus is distinguished by having a well developed exciple and 12 spored asci with an I+ dark blue cap over the ascus 

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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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