Haematomma ochroleucum  

Thallus soft, leprose or farinose, rarely weakly areolate, often wide-spreading (especially on rocks). Prothallus usually conspicuous, radiating and white-cottony. Isidia absent, the thallus and thalline margin inconspicuously sorediate. Photobiont trebouxioid.
Anamorph: sometimes present; conidiomata pycnidia, 150-200 μm diam., immersed with the upper part scarlet (K+ magenta). Conidia 12-20 × 0.5-0.7 μm, curved-filiform.
Teleomorph: ascomata apothecia uncommon in southern and eastern areas, 0.4-1.5 (-2.5) mm diam., at first hidden by thallus granules, later emergent. Disc scarlet, K+ purplish. Thalline exciple sorediate, often excluded. Epithecium scarlet, K+ magenta. Hymenium I+ blue. Interascal tissue of  richly branched paraphyses, especially so in the upper hymenium. Asci clavate, Lecanora-type, 8-spored. Ascospores 30-60 × 5-7 μm, fusiform, 3- to 7-septate, hyaline.
Chemistry: thallus C-, K+ pale yellow, Pd– pale yellow, UV– (atranorin, zeorin, porphyrilic acid and ± usnic acid).