119(118) Perithecia orange, 500-1000µm diam., in small groups on a limited stroma. Spores thick walled, 48-60 × 22-26µm, with a gelatinous sheath. _Selinia pulchra_ - Perithecia orange yellow, superficial, ca 500µm diam., with ostiole in a disc surrounded by silvery triangular tufts of hyphae ca 100µm long. Spores ellipsoid, 1-septate, 12-14 × 4-5µm. _Nectria suffulta_ 120(118) Perithecia reddish brown or pale, hyaline, with a distinct neck. 121 - Perithecia black. 131 121(120) Perithecia globose, up to 250µm diam., immersed, reddish brown, with a neck 1-3 mm long. Asci broad ellipsoid, 5-8.5µm, rapidly breaking down and difficult to see. Spores ellipsoid-allantoid. 5.5-7 × 1.5-2µm, collecting in a pearly droplet at the fringed tip of the perithecial beak. _Viennotidia fimicola_ (fig. 34) - Perithecia pyriform, very pale in colour, 60-200µm diam., with a neck 60-700µm long. Asci rarely visible. Spores pointed-fusiform, 1-3 septate, often with a sheath and clumped together in fascicles. (_Pyxidiophora_, fig. 36) 122 122(121) Neck 95-145µm long, brown, rugose, with cells arranged in 5-6 longitudinal rows visible in one view. Spores 38-52µm long. _Pyxidiophora badiorostris_ - Neck not brown or rugose, composed of hyaline, irregularly arranged cylindrical cells. 123 123(122) Spores less than 45µm long. 124 - Spores more than 45µm long. 125 124(123) Spores 35-45µm long, with brown apical or subapical patches of pigment. _Pyxidiophora brunneocapitatus_ - Spores 35-43µm long, without brown apical or subapical patches of pigment. _Pyxidiophora microsporus_ 125(123) Spores mostly 45-60µm long. 126 - Spores mostly longer than 60µm. 129 [Illustration: FIG. 34. _Viennotidia fimicola_, perithecium and spores. FIG. 35. _Phomatospora coprophila_, perithecium, and ascus with spores. FIG. 36. _Pyxidiophora petchii_, perithecium and spores.] 126(125) Perithecia 70-100µm diam., neck 100-190µm long. Spores (43)48-58(65)µm long. _Pyxidiophora grovei_ - Perithecia usually less than 80µm diam. 127 127(126) Perithecial necks mostly less than 100µm long. Spores (45)48-57(60)µm long. _Pyxidiophora arvernensis_ - Perithecial necks up to 200µm long. 128