Thelotrema fijiense Lumbsch, Lücking & Naikatini  

Mycobank MB 517814

Thallus epi- to hypophloedal, thin, whitish grey, pale olive to brown around ascomata. Thallus dull to shiny, smooth, continuous. Protocortex discontinuous, up to 20 µm thick. Algal layer continuous, crystals sparse, small. Vegetative propagules not seen. Ascomata 0.2–0.4 mm in diam., roundish, apothecioid, solitary to rarely marginally fused, semi-emergent to emergent, flattened-hemispherical. Disc often becoming partly visible, greyish to pale flesh-colored, slightly pruinose. Pores small, up to 0.25 µm in diam., roundish to slightly irregular, entire to slightly split, proper exciple apically visible from surface, whitish to off-white, incurved. Thalline rim margin thin, becoming wide to rarely gaping with age, roundish to irregular-roundish, entire, olive-brown to brown. Proper exciple becoming free, at least partly, hyaline to pale yellowish internally, yellowish brown marginally, amyloid at the base. Hymenium up to 140 µm high, clear, conglutinated, paraphyses moderately interwoven, unbranched to slightly branched, tips slightly thickened, lateral paraphyses present, inconspicuous, up to 30 µm long, columellar structures absent. Epihymenium hyaline to brown, granulose. Asci 8-spored, tholus thick narrowing at maturity. Ascospores transversely septate, cell walls thick, smooth, non-halonate, hyaline when young, becoming brown at maturity, faintly amyloid, fusiform, ends roundish to acute, loci angular to roundish, 19–27 x 5–7 µm with (7–)9–(11) septa. Pycnidia not seen. Secondary chemistry (HPTLC): no substances (all spot tests negative).