Hypotrachyna Lichen

Hypotrachyna revoluta

Parmelia revoluta Floerke, 1815:11. [Type collection: Germany, Floerke (FH-Tuck, lectotype).]

Thallus loosely adnate, rather fragile, greenish mineral gray, 3–8 cm broad; lobes sublinear to subirregular, often short and more or less ascending at the tips, subcanaliculate, 1–5 mm wide; upper surface plane, shiny, becoming very coarsely pustulate toward the lobe tips, the pustules becoming coarsely sorediate and sometimes eroding centrally leaving bare blackish areas of medulla, heavily sorediate lobes becoming revolute; lower surface black but with a brownish zone along the margins, sparsely rhizinate, the rhizines sparsely dichotomously branched. Apothecia very rare, adnate to substipitate, 2–6 mm in diameter; spores 6μ–8μ × 10μ–12μ.

CHEMISTRY.—Cortex K+ yellow, medulla K−, C+ red, P− (atranorin and gyrophoric acid).

DISTRIBUTION.—Eastern United States, West Indies, Venezuela to Chile in the Andes, Europe, South Africa, Japan, and Indonesia.

HABITAT.—On trees (hardwoods and conifers) in open or cloud forest and on rocks at 1000–4500 m elevation (at sea level in Chile).

Hypotrachyna revoluta is a species of fungus belonging to the family Parmeliaceae.

It has cosmopolitan distribution.