Absconditella
Very small, inconspicuous crust lichens with a trebouxioid alga in a thin, filmy thallus; apothecia mostly pale, with the disc level with or sunken below the level of the rim; the rim consisting of only an exciple, which is formed more or less parallel hyphae, or of cells; hymenium with more or less simple paraphyses embedded in gel; asci thin-walled along the sides, modestly thickened at the tip, IKI- or pale bluish; spores colourless, transversely septate, elliptic to fusiform.
References: Spribille et al. 2009.
Absconditella lignicola Vězda & Pišút
Thallus a thin, inconspicuous green film, often intermixed with thalli of other lichens; apothecia adnate, shallowly concave to flat, scattered, pale tan or whitish, with a thin but persistent non-algal rim coloured like the disc; spores 3-septate, 10-15 × 4.5-6.5 µ.
Reactions: All spot tests negative.
Contents: No lichen substances known.
Habitat: On moist but hard wood of logs in forest understory. Lower to middle elevations.
Similar Species: Species of the unlichenized genus Cryptodiscus are morphologically very similar, and appear to differ from Absconditella only in lacking algae.
Local Status: Rare.