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Gyalecta ulmi
Nomenclature
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Family: GyalectaceaeGenus: Gyalecta
Species:
Gyalecta ulmi
SUMMARY
Thallus thin, smooth or scurfy to finely verrucose-granular, thick white to white-grey or occasionally grey-green, smooth, rarely cracked and following irregularities of the substratum.
Anamorph: no information available.
Teleomorph: ascomata apothecia, 0.6-1.6 mm diam., numerous, scattered and sometimes ± contiguous, emergent to sessile. True exciple pale, densely white-pruinose, smooth or often crenate. Disc covered at first, 0.2-1.0 mm diam., concave, pink to pinkish brown, thinly white-pruinose especially when young, the pruina sometimes persisting, becoming chestnut brown with age. Ascospores (12-) 15-20 (-23) × 5-7 (-8) μm, broadly ellipsoidal, 3-septate, occasionally with one ± oblique.