Relicina Lichen

Relicina abstrusa

Relicina abstrusa (Vainio) Hale, 1974:484.

Parmelia abstrusa Vainio, 1890:64 [type-collection: Caraça, Minas Gerais, Brazil, Vainio 1347 (not 1346) (TUR, lectotype; UPS, isolectotype)].

Thallus closely adnate on bark or rocks, 6–10 cm in diameter, pale chartreuse yellow; lobes sublinear, 1–2 mm wide; upper surface plane to convex, continuous or faintly maculate, moderately isidiate, isidia short, mostly simple; bulbate cilia moderately inflated; lower surface black and rhizinate, the rhizines simple, shiny (Figure 8a). Apothecia adnate, 1–4 mm in diameter, coronate, basally retrorsely rhizinate, the amphithecium isidiate, the disc carob brown; spores 8, 4–5 × 5–6 μm.

CHEMISTRY.—Medulla K+ yellow turning red, C−, KC−, P+ orange, norstictic and usnic acids with or without salazinic acid and very rarely with diffractaic acid and a trace of barbatic acid and 4-0-demethylbarbatic acid. A “quintana” unknown, the reddish pink spot just below norstictic acid in both solvent systems, occurs in about one-quarter of the specimens.