Lentithecium K.D. Hyde et al., in Zhang et al.,Fungal Divers. 38: 234 (2009),
MycoBank: MB512790
Saprobic on stems and twigs of herbaceous and woody plants in aquatic habitats. Sexual state: Ascomata pseudothecial, scattered or gregarious, immersed, globose to depressed globose, dark brown to black, with sparse brown hyphae at side and base, ostiolate. Ascomatal opening slightly papillate, without periphyses and apical setae. Peridium composed of several layers of brown-walled polygonal cells. Hamathecium of 2–3.5μm wide, cellular, septate and branched pseudoparaphyses. Asci 8-spored, bitunicate, fissitunicate, cylindrical to broadly clavate, short pedicellate, with a shallow ocular chamber at rounded apex, basal to somewhat lateral. Ascospores bi-seriate to tri-seriate above, uni-seriate below, fusiform with rounded ends, 1–3-septate, hyaline, surrounded by a conspicuous gelatinous sheath. Asexual state: Unknown.

Type species : Lentithecium fluviatile (Aptroot & Van Ryck.) K.D. Hyde et al., in Zhang et al., Fungal Divers. 38:
234 (2009), MycoBank: MB 512802
Massarina fluviatilis Aptroot & Van Ryck., in Van Ryckegem and Aptroot, Nova Hedwigia 73: 162 (2001)

Fig. Lentithecium fluviatile (Material examined: BELGIUM, East-Flanders, Tielrode tidal marsh near river Schelde, IFBL coordinates, C4 21 41, on leaf sheath of Phragmites australis, Van Ryckegem 509, 4 October 2000, GENT, holotype ofMassarina fluviatilis). a Ascomata on host surface. b, c Ascomata in longitudinal section. d Peridium. e Pseudoparaphyses. f, g Asci. h Apex of ascus. i–n Ascospores. Scale bars: a =500μm, b, c =50μm, d–h =20μm, i–n =10μm