42c and d). Anamorph: none reported. Material examined: AUSTRIA, Brentenmaistal in the Viennese forest, Aesculus hippocastanum L., 1916, Höhnel (FH, holotype of Otthiella aesculi). (Note: only two slides; setae cannot be seen from the slides but could be seen from the drawings on the cover). Notes Morphology click here Keissleriella is characterized by ascomata with setae in and over the papilla, asci are cylindrical and ascospores are hyaline, 1-septate. Based on the morphological characters, K.

aesculi was regarded as conspecific with K. sambucina; as an earlier epithet, K. sambusina typifies the genus (see comments by Barr 1990a). Munk (1957) placed Trichometasphaeria C59 wnt cell line and Keissleriella in Massarinaceae, and distinguished them by their substrates (Trichometasphaeria occurs on herbaceous plants and Keissleriella on woody substrates). Bose (1961) combined Trichometasphaeria under Keissleriella, which was followed by some workers (von Arx and Müller 1975; Dennis 1978; Eriksson 1967a; Luttrell 1973). Barr (1990a), however, maintained these as distinct genera based on the differences of peridium structure and pseudoparaphyses.

Phylogenetic study The phylogeny of Keissleriella is poorly studied. Limited phylogenetic information indicates that K. cladophila forms a robust clade with other species of Lentitheciaceae (Zhang et al. 2009a). Concluding remarks The presence of black setae on the surface of papilla is a striking character of Keissleriella, but phylogenetic significance of setae is undetermined yet. Lentithecium K.D. Hyde, Cell Cycle inhibitor J. Fourn. & Yin. Zhang, Fungal Divers. 38: 234 (2009). (Lentitheciaceae) = Tingoldiago K. Hirayama & Kaz.

Tanaka, Mycologia 102: 740 (2010) syn. nov. Generic description Habitat freshwater, saprobic. Ascomata small, scattered or gregarious, immersed, slightly erumpent, depressed Pyruvate dehydrogenase spherical to lenticular, ostiolate, papillate or epapillate. Peridium thin. Hamathecium of cellular pseudoparaphyses. Asci 8-ascospored, bitunicate, fissitunicate, clavate, short-stipitate. Ascospores broadly fusoid with broadly rounded ends, 1-septate, constricted, hyaline, usually with sheath. Anamorphs reported for genus: none. Literature: Shearer et al. 2009; Zhang et al. 2009a, b. Type species Lentithecium fluviatile (Aptroot & Van Ryck.) K.D. Hyde, J. Fourn. & Yin. Zhang, Fungal Divers. 38: 234 (2009). (Fig. 43) Fig. 43 Lentithecium fluviatile (from IFRD 2039). a Erumpent ascomata scattering on the host surface. b Habitat section of the immersed ascomata. c, d Section of an ascoma and a partical peridium. Note the peridium cells of textura angularis. e Clavate 8-spored ascus with a short pedicel. f, g Hyaline, 1-septate broadly fusoid ascospores. Scale bars: a, b = 0.5 mm, c = 100 μm, d = 50 μm, e–g = 20 μm ≡ Massarina fluviatilis Aptroot & Van Ryck., Nova Hedwigia 73: 162 (2001). Ascomata 230–260 μm high × 280–325 μm diam.