Perzia triseptata  

Anamorph: not known.
Teleomorph: ascomata apothecia, in small clusters, (0.4–) 0.6–1.2 (–1.5) mm diam. (fresh collections) and ca 0.5 mm diam. (dried British material), 350-550 µm thick, erumpent from bark by lifting the outermost layer (periderm), sessile, immersed, discoid, roundish to irregularly angular, sometimes surrounded by raised lobes of periderm. Disc flat, smooth or sometimes slightly grainy, shining, somewhat gelatinous, greyish-white, becoming slightly convex with age and creamy to rufous. Exiple dark brown to black, smooth, rather thick (100–200 μm), slightly protruding (not in British material), irregularly divided into ± broad, indistinct teeth or lobes (hardly so in British material), composed of vertically oriented thin-walled mid brown intertwined hyphae 1.5-2 µm diam. Interascal tissue composed of copious very narrow paraphyses 1.2-1.5 µm diam., branched and anastomosing, slightly swollen at the apex and sometimes with short finger-like projections, also with periphysoids developing from the inner part of the exciple. Asci 220-350 x 14-24 µm (170-215 x 17.5-20.5 µm, sporiferous part 100-120 µm in British material), narrowly clavate with a very long gradually tapering stipe, fairly thin-walled and not fissitunicate, the apex obtuse to rounded with a well-developed apical cushion, not blueing in iodine, 8-spored. Ascospores 18.6-23 x 6.2-7.2 µm, ellipsoidal to fusiform-ellipsoidal, strongly constricted at each of the the ± equally spaced septa, hyaline, fairly thin-walled, smooth, with a gelatinous sheath to 3 µm thick.

Description adapted in part from Baral & Perić (2016).