Golden Moonglow Lichen

Thallus crustose, thick or thin, loosely attached to the substrate, areolate at center and radiate-plicate at margin, areolae large, up to 2.00 mm long, 1.15 mm wide, irregular in shape, usually darkened around the areolae and surface margin; marginal lobes narrow, <2.00 mm long, c. 1.50 mm wide, thick, convex and usually darkened around the tips; thallus yellowish green with usnic acid in cortex but sometimes lighter to pale yellowish white, medulla white, without the lower cortex. Apothecia cryptolecanorine to lecanorine, innate to adnate, often touching each other, roundish, 0.18 – 1.20 mm in diam., disc black, disc margin concolorous with thallus; epihymenium brown; hymenium hyaline, 80 – 100 μm high, inspersed with oil droplets; hypothecium hyaline, 80 – 125 μm high; asci clavate, Bacidia - type, 8 - spored; ascospores brown, 1 - septate, thin walled, 8.5 – 13 × 4.5 – 7 μm, markedly constricted at septum when mature. Pycnidia numerous, immersed; conidia bacilliform, 3 – 6 × 0.7 – 1 μm. Chemistry: Usnic and gyrophoric acids, occasionally with stictic acid in our examined specimens from China.