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Family: MytilinidiaceaeGenus: Actidium
Ascomata hysterothecial with an inconspicuous longitudinal slit, 0.25-0.3 mm long, 0.05-0.1 mm wide, ca 0.2 mm high, narrowly ellipsoid to fusiform from above, widening upward from a narrow base to a longitudinal ridge when viewed from the side and ± ovoid in vertical transverse section, black, smooth, sometimes concentrically striate, superficial, scattered, in no particular alignment. Peridium side walls predominantly prismatic-parallel. Interascal tissue composed of paraphysoids ca 1 µm diam, filiform with rounded ends, hyaline, smooth, sparsely sepatate, branched and anastomosed, exceeding the asci. Asci 90-100 x 7-8 µm, cylindrical tapering to a lobed base, fissitunicate, apex rounded, I-, 8-spored, arising from croziers and in parallel from the cavity floor. Ascospores 13-14 x 6.5-7 µm, narrowly ellipsoidal to fusiform, brownish, smooth, 1-septate, not or slightly constricted at the septum.
Anamorph with hyphae hyaline, smooth, septate, greyish in mass. Conidiogenous cells not differentiated from vegetative tissue, thallic, becoming many-septate, constricted at the septa and forming arthroconidia as terminal chains, sometimes branched. Conidia doliiform, hyaline, smooth, simple or becoming one-septate, catenate, schizogenous, separating at the common septum