Hypoxylon fragiforme

A species associated with beech wood (Fagus sylvatica).

Asci cylindrical, with a narrow-based pedicel, uniseriate, 8-spored, up to 175 µm long and 7-10 µm wide, with all spores concentrated in the upper half of the ascus, with an amyloid apical apparatus staining blue in Melzer's reagent.

Paraphyses filiform, slender, hyaline, branched, projecting significantly above the asci.

Ascospores ellipsoidal, slightly flattened on one side, very dark brown, smooth, with an inconspicuous germ slit extending nearly the entire spore length, and a perispore dehiscent in KOH.