Stegonsporium pyriforme  

Anamorph: conidiomata acervular, subperidermal, separate or aggregated, irregularly dispersed, globose or lenticular, 1-4 mm long, composed of brown thin-walled angular tissue and forming pulvinate or effuse masses of black conidia on the surface of the substrate. Conidiophores  (18-) 21-36 x (2·5-) 3.5-6 µm, hyaline, branched and septate at the base, cylindrical, formed from the upper cells of the conidioma. Conidiogenous cells annellidic, straight, hyaline, cylindrical, with 0-6 annellations which occasionally may be flared. Conidia (23-) 31-38 (-42) x (13-) 14-18 (-20) µm, clavate, pyriform or obovoid, obtuse at the apex, truncate at the base, olivaceous to brown, smooth, with (3–)4–5(–7) transverse and 1-3 longitudinal or oblique distosepta, the cell lumina considerably reduced, walls comparatively thick, with a hyaline gelatinous sheath 1–2 mm thick at the base of the conidium that sometimes degenerates to a hyaline marginal frill. Paraphyses septate, hyaline, cylindrical, flexuous, to 200 µm long and  2-3.5 µm diam. the base often expanded to 4-6 µm diam.
Teleomorph: Pseudostromata 0.7–2 mm diam. Surface tissue between ostioles and around the top of the perithecia white, greyish to yellowish, compoased of altered bark cells and narrow hyaline to yellowish hyphae. Ostioles cylindrical, light brownish, emerging from perithecial apices and merging separately with the stromatal disc, inconspicuous and often invisible on the surface. Ascomata perithecia, (250–)350–550(–650) µm diam., 200–450 µm high. Peridium (11–)13–25(–32) µm thick. Paraphyses 6–12 µm diam., multiguttulate. Asci (135–)150–200(–240) x 28–43(–51) µm, clavate to ellipsoidal, thick-walled, appearing bitunicate when immature, the apex containing a refractive ring usually wider towards its base, 8-spored. Ascospores (30–)34–43(–49) x (12.5–)14–17(–21) µm, ellipsoidal, cylindrical or rarely pyriform, with (3–)5 transverse distosepta and sometimes a single longitudinal distoseptum in a few of the cells; with gelatinous appendages on both ends projecting (4–)5–8(–11) µm and (9.5–)11–14 (–16) µm diam., subglobose, the outer margin becoming diffuse.