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 Thallus: crustose, continuous or rimose-areolate or verrucose-areolate; prothallus: not visible; areoles: flat or verruculose, thin or thick, opaque, ecorticate; surface: yellowish white to yellowish gray or whitish gray to gray or pale green to greenish white, smooth or rough, epruinose, with an indistinct margin, esorediate; Apothecia: sessile, 0.4-0.8 mm in diam., lecanorine; disc: red-brown or orange-brown, plane, epruinose; margin: concolorous with thallus, thin or thick, persistent, even, entire or flexuose, smooth, entire or verrucose or verruculose, without a parathecia crown; amphithecium: present, with numerous algal cells, with large crystals insoluble in K, corticate; cortex: present, hyaline, distinct, basally thickened, gelatinous or interspersed, (15-)20-25(-30) µm thick laterally, 25-40 µm thick basally; parathecium: hyaline, containing crystals soluble in K; epihymenium: red-brown to orange-brown, with pigment dissolving in K, with crystals dissolving in K; hymenium: hyaline, clear; paraphyses: thickened (up to 4 µm wide) apically, not pigmented; subhymenium: hyaline, 15-20 µm thick; hypothecium: hyaline, without oil droplets; asci: clavate, 8-spored; ascospores: hyaline, simple, ellipsoid or broadly ellipsoid, (9.5-)13.5-15(-15.5) x (5.5-)6-7(-7.5) µm; wall less than 1 µm thick; Pycnidia: immersed, cerebriform or ovoid; conidiophores: type II sensu Vobis; conidia: filiform; Spot tests: K+ yellow, C-, KC-, P- or P+ yellow, or P+ pale orange to red; Secondary metabolites: atranorin (major), chloroatranorin (minor), gangaleoidin (major), nephrosteranic acid (major or absent), and norgangaleoidin (minor).; Substrate and ecology: on bark of deciduous trees; World distribution: a subcosmpolitan species occurring in Africa, Asia, Europe, and North and South America; Sonoran distribution: montane areas of Arizona, coastal mountains of southern California,Baja California, and Chihuahua.; Notes: Lecanora chlarotera is treated here as circumscription used by Guderley (1999), which differs slightly from that of Brodo (1984). In our circumscription, Lecanora chlarotera includes specimens with sessile apothecia with large amphithecial crystals, a granular epiphymenium, and the presence of the gangaleoidin chemosyndrome. In Brodo's (1984) circumscription specimens lacking gangaleoidin were also included under this name. However, such morphologically indistinguishable specimens lacking gangaleoidin were not present in the study area. Lecanora chlarotera is similar to L. viruduloflava, which differs in having heavily pruinose apothecial discs. Brodo (1984) regards L. rugosella Zahlbr. as a distinct species (see p. 155) and lists specimens of both L. chlarotera and L. rugosella from the Sonoran region. 

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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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