Catinaria radulae

No lichen body (thallus) was observed in the available material, and no algal partner (photobiont) was detected. The fruiting bodies (apothecia) are black, disc-shaped, and about 0.30–0.35 mm in diameter, with a slightly raised margin matching the colour of the disc. The outer rim (exciple) is brown and about 50 μm thick, built of weakly radiating hyphae with brown-pigmented tips; the spore-bearing layer (hymenium) is colourless (hyaline), not filled with oil droplets, and about 75 μm tall, while the tissue beneath it (hypothecium) is brownish and thin (about 25 μm tall). The paraphyses (sterile filaments between the asci) are unbranched (about 2 μm wide, occasionally to 3 μm) and may have brown pigment caps at the tips. The asci are narrowly club-shaped (clavate; about 35 × 12 μm) and each contains eight ascospores. The ascospores are colourless, 2-celled (1-septate), 12.5–17.5 × 6–7 μm, and have a conspicuously warted outer wall. Pycnidia were not observed, and standard spot tests were negative (K−, C−, KC−, P−, UV−). The material was too limited for a full thin-layer chromatography assessment.

Catinaria radulae is so far known only from the Cape Horn Archipelago in southernmost Chile, where it has been collected from three sites on three different islands, including Tierra del Fuego (Parque Nacional Alberto de Agostini), Londonderry Island, and Basket Island. It grows directly on the thallus of the liverwort Radula flavifolia, typically on sheltered surfaces such as the underside of branches and trunks of Drimys winteri in Magellanic tundra at low elevations. Although several Radula species were encountered with bryophilous fungi during the same inventory work, this species was only found on R. flavifolia. Additional Radula material examined from outside the archipelago (including the Brunswick Peninsula) did not yield further collections.

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