You are here
Family: AcarosporaceaeGenus: Acarospora
Thallus crustose, areolate; areoles 0.3-2 mm wide, rounded or irregular, markedly contiguous, often in lines following minor fissures in pale striate, pale to deep red-brown. Photobiont chlorococcoid.
Anamorph: not known.
Teleomorph: ascomata apothecia, numerous, round, mostly 1 (-3) per areole, aggregated, dark grey- to red-brown, darker than the thallus and often extending across the entire areole. Thalline margin somewhat prominent, very swollen and globular, white-striate, paler than the disc. Disc 0.1-0.3 mm diam., plane and sunken, oblong or kidney-shaped, rarely contorted, deep red chestnut brown. Hymenium 80-100 μm high. Interascal tissue of mostly unbranched paraphyses 100-110 µm in length, 1.5-2 μm diam. at the base, 2-4 μm diam. at the dark brown capitate apices, immersed in gel with a pale yellow epithecium. Asci clavate, multispored, the apical dome not staining in iodine. Ascospores 4-6 × 1-2.5 μm, ellipsoidal, hyaline, aseptate, without a gelatinous sheath or appendages.
Chemistry: thallus C–, K+ red, KC+ red (crystals), Pd+ yellow-orange (norstictic acid). The reactions are only clearly visible on the apothecium margin.
BLS species page - here.
Lichens Marins, Maritimes et Oceaniques - images here. Association Francaise de Lichénologie - images here.