Leptosillia wienkampii (J. Lahm ex Hazsl.) Voglmayr & JaklitschThallus inapparent, not lichenized, developing on the bark of different deciduous trees. Perithecia black, matt, superficial (0.12-)0.17-0.26(-0.32) mm across, smooth to areolate, scattered singly, pyriform, circular from above, with a central apical papilla laterally slightly enlarged by stellate or sulcate structures. Exciple continuous, of a textura angularis, composed of an outer dark brown, 25-40 μm thick layer of thin-walled isodiametrical to laterally compressed cells with dark brown walls, and an inner, hyaline to pale brown layer of (sub)hyaline to light brown, slightly smaller cells. Paraphyses hyaline, smooth, thin-walled, septate, rarely branched, 1.3-4 μm thick, embedded in a I- gelatinous matrix; periphyses smooth, thin-walled, unbranched, less than 2 μm wide. Asci 8-spored, cylindrical or clavate, unitunicate, thin-walled, without a distinct apical apparatus. Ascospores 1-celled, hyaline, falcate to lunate, (22-)26-39(-48) x (3-)3.5-4.2(-5) μm, thin-walled, smooth, with broadly rounded ends, multiguttulate. Pycnidia scattered, black, slightly smaller than perithecia. Conidia simple, falcate, hyaline, (5-)5.5-6.2(-7) x (1.4-)1.6-1.9(-2.1) μm, thin-walled, smooth, with narrowly rounded ends, with a few guttules. Photobiont absent. Spot tests: all negative. Chemistry: without lichen substances.