Leioderma duplicatum

Detailed description

Thallus forming rosettes to 5 cm wide. Lobes ±concave, subcanaliculate towards margins, 1–3(–5) mm wide, linear–laciniate. Margins raised, slightly thickened, sinuous, sometimes frosted–pruinose, phyllidiate. Phyllidia peltate–squamulose, rarely digitate, sometimes spreading onto upper surface and occasionally forming a thick, diffract, marginal crust. Upper surface markedy uneven but often glossy, and with conspicuous pale-brown apothecial initials, glaucous–olivaceous when wet, suffused red-brown at margins. Lower surface white at margins, brownish centrally, with densely clustered fascicles of silky, white to blue-black rhizohyphae, normally projecting beyond lobe margins. Apothecia rare, 0.1–1.5 mm diam., disc concave becoming plane, matt, epruinose, pale to dark red-brown with persistent paler, entire to shallowly sinuous proper exciple, slightly raised above disc. Hymenium I+ persistent blue. Ascospores 12–20 × 6–10 μm.

Chemistry: TLC−, all reactions negative.