Ceratosphaeria mycophila  

Ascomata 300-350µm diam, the body ± globose, superficial or partially immersed, black, smooth, leathery; the neck strongly papillate, 50-80µm long, gradually tapering towards the apex, black. Peridium composed of outer layers of almost black textura epidermoidea, the cells rarely more than 4µm diam, merging into poorly-defined textura intricata in the neck region, and an inner layer of ± hyaline cells. Interascal tissue well-developed, composed of very thin-walled unbranched tapering paraphyses ca 3 µm diam. along most of their length, to 7 µm diam. near the base. Asci 200-230 x 11-12.5 µm, cylindrical with a long tapering stipe, fairly thin-walled, not fissitunicate, the apex rounded with a distinct refractive ring ca 2.5 µm diam. and 1-1.5 µm thick, 8-spored. Ascospores arranged biseriately, 41-52 x 4.3-5.3 µm, narrowly cylindrical, straight or slightly curved to sigmoid, 7-9 (-11) septate, the septa very thin and usually obscured by large guttules, not constricted at the septa, hyaline, thin- and smooth-walled, without a gelatinous sheath.