Dimerella lutea (Dicks.) Trevisan
Coenogonium luteum (Dicks.) Kalb & Lücking.
Thallus sometimes hardly visible, evanescent, grey, grey-greenish, bronze. Apothecia usually numerous, 0.5-2 mm diam., disc flat when dry, convex and slightly translucent when humid, yellow-orange, yellow-apricot, exciple more or less translucent when humid, white-orange when dry, marginpersitent more or less transparent and inconspicuous when moist, distinct and white-orange when dry. Ascii 8-spored, cylindrical, 55-65 x 4-5 (7) µm selon nos mesures according to our measures. Ascospores colourless, narrowly ellipsoid, 1-septate, 8-11 x 2.5-3.5 µm according to literature, 8-11 (12) x 3-4 µm according to our measures. Paraphyses swollen on top. Photobiont: Trentepohlia. Chemical spot tests negative. Common, tropical trends, no specific maritime affinity; on mosses of bark on old deciduous trees of oceanic forests, less frequent on rock mosses or bare bark. In our prospection area this species is almost always associated to Frullania. See Dimerella pineti with smaller apothecia, growing on barks. N.B. Apothecia are numerous only in winter and spring.