Hypotrachyna andensis Hale

Hypotrachyna andensis

Thallus arcte adnatus vel adnatus, fragilis, 4–7 cm latus, viridi-flavicans, lobis sublinearibus, separatis, 1–3 mm latis; superne isidiatus, isidiis lobulatis; cortex superior 12μ–14μ crassus, stratum gonidiale 24μ–28μ crassum, medulla alba, 120μ–130μ crassa, cortex inferior 12μ–14μ crassus; subtus niger, dense rhizinosus. Apothecia substipitata, sporis simplicibus, 10μ × 14μ.

Thallus closely adnate on twigs or on soil, fragile, 4–7 cm broad, yellowish green; lobes sublinear, rather elongate, mostly separate, 1–3 mm wide; upper surface plane, continuous, becoming isidiate, the isidia at length lobulate, the lobules dorsiventral, about 0.5 mm long, often with short cilia; lower surface densely rhizinate, the rhizines moderately dichotomously branched. Apothecia substipitate, 1–3 mm in diameter; spores 10μ × 14μ.

CHEMISTRY.—Cortex K−, medulla K+ yellow turning red, C−, P+ orange (usnic acid, norstictic acid, and salazinic acid (holotype); or more rarely norstictic acid, stictic acid, and constictic acid).

TYPE COLLECTION.—San Martín, Peru, Holligan L 128 (BM, holotype).

DISTRIBUTION.—Central America, Colombia, Venezuela, and Peru.

HABITAT.—On branches of small shrubs in the paramo or on road banks at 2800–3700 m elevation.

Hypotrachyna andensis is a species of foliose lichen in the family Parmeliaceae. It is known to occur in the Neotropics and in Papua New Guinea.