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Family: ArthoniaceaeGenus: Coniocarpon
Thallus immersed, often mosaic-forming and delimited by a brown line, off-white, pale grey, pale fawn or sometimes tinged dull orange in parts, surface smooth or (especially on thick bark) finely powdery.
Anamorph: conidiomata pycnidia, immersed, ca 60 μm diam., the walls red-brown, K+ olive-grey. Conidia 3.5-5.5 × ca 0.8 μm, bacilliform.
Teleomorph: ascomata arthonioid apothecia, (0.2-) 0.3-1 × 0.2-0.5 (-0.7) mm, flat to slightly convex, rounded, ± polygonal or linear, occasionally branched but rarely stellate (to 1.5 mm diam); white-pruinose with (usually) marginal, rose-red to cinnabar-red pruina, old apothecia often not pruinose and dark pale purple-brown; in section 110-140 μm tall. Epithecium brown with patches of purple-red pigment (K+ red or purple, dissolving) especially at the outer edge, often also with numerous minute granules (pruina). Hymenium 60-70 μm tall, hyaline or pale orange-red. Hypothecium 25-40 μm tall, ± hyaline. Interascal tissue of pseudoparaphyses 1-1.5 μm diam., but often brown-walled and to 2.5 μm diam. in the epithecium, a few with apical caps. Ascospores (18-) 20-28 × 7-9.5 μm, (2- to) 4- to 5- (to 6-) septate, cylindric-ovoid, hyaline (over-mature ascospores brown and wrinkled but not warted), smooth, with a well-developed epispore.
Chemistry: at least three unidentified anthraquinones (orange, lilac and red) by TLC.