You are here
Family: StigmatodiscaceaeGenus: Asterodiscus
Anamorph: a hyphomycetous anamorph is formed in culture, described by Voglmayr et al. (2016).
Teleomorph: ascomata apothecia, embedded in cortex of dead twigs, initially covered by bark, erumpent through irregular radial cracks, forming a circular to elongate flat disc 200–600 μm diam., sometimes confluent, dark brown to black, without a distinct margin. Subhymenium 15–20 μm thick, brown, of tightly packed subhyaline to light brown hyphae 3–8 μm diam. Interascal tissue of paraphyses 80–150 μm long, 2–3.5 μm diam., the cells sometimes becoming inflated with age, with free swollen, club-like ends to 9 μm diam., with an olivaceous, emerald to deep blue amorphous incrustation. Hymenial gel in lower part hyaline, in upper part dark olivaceous, emerald to deep blue. Asci (70–) 95–145 × (35–) 40–60 (−72) μm, variable in shape from broadly fusiform to saccate, thick-walled and fissitunicate, not staining in iodine, 8-spored. Ascospores arranged bi- or triseriately, (33–) 40–45 (−49) × (13–) 14.5–16.5 (−17.5) μm, asymmetric, at first 1-septate, developing 2 additional distosepta and becoming 3-septate with age, strongly constricted at the primary septum, weakly at secondary septa, secondary septa with large pores, hyaline to light brown with age, becoming dark brown after ejection, ends mostly rounded, distal ends sometimes subacute, wall smooth to finely verruculose, the contents granular, with a large, strongly refractive guttule in each cell, surrounded by a thick gelatinous sheath.