Rosellinia mammiformis

With uniperitheciate stromata, bearing subglobose perithecia carbonaceous in appearance, 0.7 to 1 mm in diameter, black, with a conical papillate ostiole, without a common subiculum, at most with a thin cream-white mycelial layer that tends to disappear in mature stromata.

Asci cylindrical, eight-spored, uniseriate, 150 to 180 µm long, 10 to 12 µm wide, with an amyloid apical apparatus 3.5 to 5 µm long and 2.8 to 3.8 µm wide.

Abundant interascal tissue consisting of filamentous, hyaline paraphyses, 2 to 3 µm wide, projecting considerably above the asci.

Ascospores ellipsoidal to fusiform, inequilateral with one flattened side, brown under the microscope, 18 to 24 µm long, 5 to 7 µm wide, with a straight germ slit extending the entire length of the spore, and a slimy sheath present at both ends.