Hyaloscypha leucostigma

On decorticated trunk of an unidentified broadleaf tree.

Marginal hairs short, with swollen base, smooth, hyaline, aseptate, up to 20 µm long, with pointed apices.

Excipulum hyphae of textura globulosa-angularis, elongating toward the margin to form more or less rectangular hyphae, parallelly arranged, hyaline and slightly thick-walled.

Asci cylindric-clavate, 8-spored, with biseriate to irregular spore arrangement, without croziers at their base, up to 60 µm long and up to 8.5 µm wide, with an amyloid reaction of their small apical apparatus in Melzer's reagent.

Paraphyses filiform, slender, smooth, cylindrical, unbranched, without apical swellings, only up to 2 µm wide, not projecting above the level of the asci.

Ascospores cylindric-ellipsoidal, slightly allantoid, smooth, hyaline, thin-walled, with abundant vacuolar internal content.