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Family: GraphostromataceaeGenus: Biscogniauxia
Stroma erumpent through bark, 20-70 mm long and 5-40 mm broad, 0.8-1 mm thick, applanate and spreading, carbonaceous, matt black, with a dark brown outer layer 400-800 µm thick that dehisces to expose the ostioles, internal stromatal tissues poorly developed.
Anamorph: Nodulisporium-like (Periconiella-like fide Ju & Rogers 1996).
Teleomorph: ascomata perithecia, 200-350 µm diam. and 500-800 µm tall, in a single layer, pyriform to nearly cylindrical, frequently somewhat compressed. Ostioles strongly papillate, extending significantly above the stroma surface. Interascal tissue of copious thin-walled unbranched paraphyses. Asci 160-180 x 9-12.5 µm, the spore-bearing part 120-150 µm in length, cylindrical with a fairly short stalk, fairly thin-walled, not fissitunicate, the apex obtuse to rounded with an apical ring-like structure 4-5 µm diam. and 2-3 µm tall that blues in iodine, 8-spored. Ascospores arranged obliquely uniseriately, (14-)15-21(- 22.5) x 6.5-8.5(-9) µm, dark brown to black, ellipsoidal to fusiform-ellipsoidal, the ends rounded or somewhat attenuated, occasionally subacute, with a straight germ slit extending the full lengthof the spore, without a gelatinous sheath or appendages.