Pyrenopsis grumulifera  

Thallus: not clearly differentiated.
Anamorph: conidiomata similar in structure to the ascomata. Conidiogenous cells 3-5 x 1.5-2 µm, ellipsoidal to doliiform with an attenuated apical region, probably proliferating percurrently. Conidia 2.5-3.5 x ca 1 µm, bacillar, hyaline, aseptate, thin- and smooth-walled.
Teleomorph: ascomata in small clusters on a cyanobacterial mat, apothecia, ± immersed to superficial, 55-80 µm diam. and 40-60 µm tall, urecolate to cupulate, the opening 30-40 µm diam., sessile, slightly constricted at the base, with a broad ± smooth margin, glossy black. Excipulum composed of thick olivaceous ± parallel to interspersed hyphae 3-4 µm diam. within a gelatinous matrix, paler underneath, without hairs. Interascal tissue composed of thin-walled unbranched paraphyses ca 2 µm diam. within a gelatinous matrix, with an epithecial gelatinous layer that stains blue in Lugol's iodine. Asci 44-55 x 9-12 µm, cylindric-clavate, short-stalked, fairly thick-walled with rostrate dehiscence, the apex rounded, the wall and contents showing a strong dextrinoid reaction in Lugol's iodine, the walls of discharged asci persisting, 8- to 16-spored. Ascospores arranged biseriately, 10-5-12 x 3-3.5 µm, ellipsoidal to clavate, slightly constricted in the central part and appearing to have a narrow ± median septum [a pseudoseptum], hyaline, thin-walled, smooth, without an epispore or gelatinous sheath.