Heterodermia subneglecta Elis
Heterodermia obscurata auct. europ. non (Nyl.) Trevis p.p.
Heterodermia japonica (M. Sato) Swinscow & Krog ss. Moberg p.p.
Thallus reaching up to 10 cm across, lobate, lobes 1-2 mm wide, marginal lobes recurved, fringed with short black cilia and more or less globular soralia at margins, upper surface very pale white-greyish, pale white-greenish when dry, pale greenish-white and glaucous when moist, lower surface creamy-white. Apothecia very rare, disc dark brown, margin crenulate and sorediate. Ascospores broadly ellipsoid, 1-septate, 21-31 x 12-17 µm. Photobiont: chlorococcoid. C-, K+ yellowish, KC-, Pd-. Oceanic species, grows on soils at the base of rocks or in heaths of very exposed aerohaline heathlands, sometimes on acide rocks ; rare, its observation requires a targeted search (DO NOT SAMPLE). N.B. Synonymy of Heterodermia is peculiarly confused and numerous taxa have been diversely interpreted by authors ! What we present here under the name Heterodermia subneglecta was formerly described as Heterodermia japonica or Heterodermia obscurata, these names encompassing all species growing on tree barks in oceanic forests.