Lentithecium fluviatile (from IFRD 2039). a Erumpent b 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