Hypotrachyna Lichen

Hypotrachyna producta

Thallus laxe adnatus, 6–7 cm diametro, cinereo-albicans, lobis sublinearibus, 2–3 latis, superne sorediatis; cortex superior 13μ–15μ crassus, stratum gonidiale 14μ–16μ crassum, medulla alba, 65μ–90μ crassa, cortex inferior, 12μ crassus; subtus niger, modice rhizinosus. Apothecia ignota.

Thallus loosely adnate on bark, whitish mineral gray, 6–10 cm in diameter; lobes sublinear, becoming elongate and subdivaticate, 2–4 mm wide; upper surface shiny, plane, sorediate, the soredia subterminal in orbicular soralia, the sorediate lobes becoming subrevolute; lower surface moderately rhizinate, the rhizines moderately to densely dichotomously branched. Apothecia not seen.

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

TYPE COLLECTION.—On Picea rubens, Mt. LeConte, Sevier County, Tennessee, Nakanishi 174, 8 May 1971 (US, holotype; KOBE, isotype).

DISTRIBUTION.—Southeastern United States, Colombia, and Africa.

HABITAT.—On trunks and branches of trees (hardwoods and conifers) in open forest at 2000–3600 m.