Hemigrapha atlantica  

Anamorph: conidiomata interspersed with ascostromata, similar in overall appearance. Conidiogenous cells similar in form to periphysoid-like cells within the ascoma, probably proliferating percurrently. Conidia 5-7 x ca 2 µm, cylindrical to bacilliform, sometimes slightly bent, the base ± truncate, hyaline, aseptate, without a gelatinous sheath or appendages.

Teleomorph: ascostromata 200-600 µm diam, hysterothecial, radiately short-branched and often star-shaped from above, with a longitudinal slit running along each branch and meeting at the centre, black, smooth, superficial, opening when wet to reveal a brownish hymenium, gregarious to crowded and sometimes confluent. Peridium with side walls composed of angular to prismatic dark red-brown thick-walled cells, basal region absent, with a very thin layer of indistinct hyaline cells forming the floor of the cavity and seated directly on the substrate, layer of hyaline cells 4-6 µm deep. Interascal tissue absent (possibly deliquescing at an early stage of maturity), or present as thin indistinct paraphysoids 1-1.5 µm diam. Periphysoid-like cells lining the upper wall, 3-11 x 2.5-4 µm in size. Asci 21-23 x 10-14 µm, subglobose to clavate-saccate, ± sessile, apically thick-walled, with two discernable layers, J-, 8-spored, arising parallel to each other from the floor of the cavity and forming a hymenial layer that swells to become exposed when wet. Ascospores 13-15 (-17) x 4-6 µm, ellipsoidal to ovoid, hyaline when young, becoming pale brown and minutely roughened, 1-septate, with one cell more rounded than the other, without a gelatinous sheath or appendages.