Mixtoconidium insidens  

Anamorph: conidiomata pycnidia, 100-300 µm diam., ± spherical, immersed in galls (200-500 µm diam.) of the host, very similar in appearance to apothecia with a black "disk" and a conspicuous paler; the galls each contain one well-developed conidioma and sometimes a few small less-developed conidiomata. Conidiomatal wall dark brown, composed of intertwined hyphae, the cells dark brown with a distinctively verrucose outer layer. Conidiophores not present, or reduced to short undifferentiated cells. Conidiogenous cells and conidia of two types, mixed within the same conidioma. Macroconidiogenous cells often dominating, 8-11 (-13.5) x 2.5-3 (-3.5) µm at the base, ± cylindrical or slightly tapering, percurrently proliferating with several to numerous very conspicuous annellations and persistent collarettes. Macroconidia 12-14.5 x (4-) 4.5-5 µm, rather variable in shape, cylindrical to cylindric-ellipsoidal or rarely cylindric-ovoid, sometimes slightly curved, hyaline, (0-) 1-septate, the septum ± median and hardly to moderately constricted, the apex obtuse to rounded and the base rounded to truncate, thin-walled, smooth, without an epispore or gelatinous sheath. Microconidiogenous cells 9-12 x 1.5-2 µm, similar to the macroconidiogenous cells but narrower and more tapering, with less conspicuous annellations. Microconidia 5-6.5 x 1.5-2 µm, cylindrical, aseptate, hyaline, smooth- and thin-walled.
Teleomorph: ascomata 250–550 μm diam., first flat, soon convex, in groups of two to six emerging from the same point and forming roundish compound structures to 1.5 mm diam., dark brown, covered by orange pruina, K+ purple. Exciple orange-brown, K+ olivaceous brown, 20–30 μm thick laterally and to 60 μm thick in the base, composed of hyphae covered by small brown granules. Epithecium brown with many orange crystals, K+ purple. Hypothecium brownish. Hymenium 60–90 μm thick, yellowish, I+ red, KI+ blue, with strongly branched and anastomosed paraphyses. Asci 55–67 × 12–19 μm, clavate, not blueing in iodine, 8-spored. Ascospores 16-21 x 6-8 µm, at first hyaline, soon brownish, 3-septate, the second cell larger, containing small guttules, with a sheath 0.5–1 μm thick [information from van den Boom & Etayo 2017].