Polycoccum squamarioides  

Anamorph: not known.
Teleomorph: ascostromata perithecia, immersed in clusters within galls on the host thallus; 100-150 µm diam., ± globose. Peridium pale brown beneath and composed of 2-3 layers of flattened thin-walled mid brown angular cells to 12 µm diam., dark brown near the ostiole with an outer layer of irregular flattened ± hyphal cells 3-5 µm broad, the ostiole surrounded by short dark brown thick-walled hyphae ca 4 µm thick. Interascal tissue composed of persistent, frequently branched and anastomosed thin-walled pseudoparaphyses 2-2.5 µm in diam. Asci 85-125 x 14-16.5 µm, ± cylindrical, rather short-stalked, the apex rounded to truncate, very thick-walled but not obviously fissitunicate, without clearly-defined apical structures, 8-spored. Ascospores arranged biseriately, 17.5-24 x 5.5-6.5 µm, fusiform to fusiform-ellipsoidal, slightly constricted at the ± median septum, the ends obtuse, olivaceous to almost black when mature, finely verrucose, without an epispore or gelatinous sheath.

Map (c) British Lichen Society