Slideshow image
Xanthoparmelia taractica (Kremp.) Hale
Family: Parmeliaceae
[Parmelia conspersa f. hypoclysta (Nyl.) Hillmann,  more]
Xanthoparmelia taractica image
Lucy Taylor  
Ecology: Lichenized; terricolous (found on soil and spreading onto rock); growing under conditions which are dry. Thallus: Foliose, isotomic-dichotomous (primary and marginal lobes subdichotomously branched), lobed; lobes elongate or linear (sublinear to subirregular), imbricate (lobes variable, often forming a dense, imbricate mat); plane; separate thallus parts 2-4-(8) mm wide. Thallus Size and Differentiation: 7-10 cm in diameter; apex rounded (subrotund). Upper Surface: Lime green (darkening with age), glossy (shiny), smooth (to slightly rugulose); fissurate (developing cracks in older lobes); fissures transversely oriented oriented; immaculate; wrinkled (becoming +/- rugose); not isidate; not sorediate; lobulate (laciniae sometimes developing from thallus centre, elongated dichotomously branched, 0.5-1.5 mm wide, without lobules). Lower Surface: Present, brown (darker in centre, often shiny) or pale brown; attached by holdfasts (loosely to moderately adnate); wrinkled (rugose and papillate); rhizinate (slender); rhizines moderately abundant (especially near lobe margins), brown (concolorous with lower surface) or pale brown, not branched (often tufted). Medulla: White. Reproduction Strategy: With sexual (and possible asexual) stages (occasional). Ascocarps: Apothecioid, soon sessile, 3-6 mm in diam.. Margin: Crenulate (becoming crenulate), distinct (rugulose, entire and involute). Disk: Excavate to plane (becoming flat), brownish red. Ascospores: 8-10 µm long, 6 µm wide. Conidiomata: Present (common). Conidia: Bifusiform; 5-7 µm long; 0 µm wide. Secondary Metabolites: Present; consalazinic acid, salazinic acid, and usnic acid. Spot Tests: Cortex: KC – medulla: K + yellow changing to red, C –, KC + red, PD + orange. UV-Fluorescence: Upper thallus surface – (negative).