Acrocordia conoidea (Fr.) Korber var. conoidea

    Thallus crustose, mainly immersed, occasionally superficial and cracked, smooth or finely granular, effuse, pale grey or brownish grey, often with pinkish tinge when fresh but grey-pink or grey if dry or within herbarium. Perithecia regularly distributed,  0.5-1 mm diam., one quarter to half immersed but prominent, conical-hemispherical, apices often flattened and with the ostiole projecting as a small papillia. Ascii cylindrical, K/I-, apex pointed with a terminal minute sphere (clearly visible after blue Coton dyeing), 100-110 x 10-12 µm according to our measures. Ascospores  broadly ellipsoid, uni-septate, apex most often hemispherical (ball of wool-shaped),  12-18 x 7-9 µm according to our measures. Pycnidia frequent, often numerous visible as black small dots. Photobiont: Trentepohlia. Chemical spot tests. negative. Rare in our prospection area since developing on hard limestones. Near the seashore, possible confusion with Acrocordia macrospora growing on siliceous rocks, but thallus is not pink and spores larger and with  Acrocordia salweyi displaying spherical perithecia and growing on mortar of old walls.*