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Taxon Pages
Sticta venosa Lücking, Moncada & Robayo
Nomenclature
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Family: LobariaceaeGenus: Sticta
SUMMARY
Mycobank MB 517812
Thallus growing on the ground between mosses and hepatics, up to 15 cm diam., individual lobes up to 10 cm long, linear to slightly flabellate, 3–5 mm wide, much branched especially towards the tip; upper and lower surface strongly and reticulately ridged, appearing faveolate. Photobiont cyanobacterial (Nostoc). Upper surface blue-grey with brownish tinge when fresh, pale brownish grey when dry, glabrous; lower surface white to yellowish white, glabrous except for thin lines of dark brown tomentum growing on top of the ridges and forming distinct, thin, radiating veins; tomentum up to 2 mm thick, formed by strongly branched and partly conglutinated hairs with cylindrical cells; cyphellae scattered, minute, up to 0.15 mm diam., with pore-like opening (thelotremoid), white, K–. Lobe margins much incised and crenulate, with tufts of up to 0.5 mm long, dark brown hairs growing from the incisions especially at the lobe tips; lobe margins otherwise and towards the thallus center forming numerous marginal isidia, isidia terete to flattenend, unbranched to branched and partly resembling phyllidia, 0.05 mm wide and up to 0.5 mm long, of the same color as the upper lobe surface. Upper cortex paraplectenchymatous, consisting of 1–2 cell layers, 15–25 µm thick, hyaline; cyanobacterial layer 25–50 µm thick; medulla composed of longitudinally oriented, more or less compacted hyphae, up to 100 µm thick; lower cortex paraplectenchymatous, consisting of a single cell layer from which the tomentum emerges, 15–25 µm thick, brown, cells with rounded outer surface. Apothecia not observed. Secondary chemistry: no substances detected by TLC; thallus and medulla C–, K–, P–.