Thelotrema fijiense

Thelotrema fijiense has a thallus that is either epiphloedal or hypophloedal, thin, and varies in colour from whitish grey to pale olive or brown around the ascomata (fruiting bodies). The surface of the thallus can be either dull or shiny and is smooth and continuous, with a discontinuous protocortex up to 20 μm thick. The algal layer of the thallus is continuous, featuring sparse, small crystals. This species does not make vegetative propagules such as isidia or soredia. The ascomata of Thelotrema fijiense are roundish, measuring 0.2–0.4 mm in diameter, and appear either solitary or occasionally fused at the margins, with a semi-emergent to emergent, flattened-hemispherical shape. The disc of the ascomata may become partly visible, with a greyish to pale flesh-coloured hue and is slightly pruinose. The pores are small, up to 0.25 μm in diameter, and range from roundish to slightly irregular. The proper exciple is visible from the surface, and is whitish to off-white, and incurved. The thalline margin of the lichen is thin, widening or occasionally gaping with age, olive-brown to brown in colour, and usually roundish to irregularly roundish with an entire edge. The proper exciple becomes free, at least in part, and is hyaline (translucent) to pale yellowish internally, with a yellowish-brown marginal area that is amyloid at the base. …

Thelotrema fijiense has been identified solely from its type location on Taveuni Island in Fiji. It is found growing on twigs within a cloud forest, at an elevation of 800 m (2,600 ft).

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