73(69) Apothecia white, covered with tapering squamules composed of septate hyphae. Spore clusters 38-43 × 15-17µm. Spores 16-17.5 × 7-8.5µm, smooth or finely punctate. _Saccobolus caesariatus_ - Apothecia not white, without tapering scales. 74 74(73) Spore clusters mostly over 40µm long. 75 - Spore clusters mostly under 40µm long. 76 75(74) Spore clusters 38-62 × 14-19µm. Spores 13-21.5 × 6.5-9.5µm, smooth, finely warted or with reticulate cracks. Apothecia 0.2-2mm diam. _Saccobolus versicolor_ (fig. 10) - Spore clusters 42-60 × 18-24µm. Spores very coarsely warted, 17.5-23 × 8.5-10µm (inc. warts). _Saccobolus beckii_ [Illustration: FIG. 10. Spore clusters of, from left, _Saccobolus versicolor_, _S. glaber_ and _S. truncatus_.] 76(74) Spore clusters compact, 26-43 × 13-19µm. Spores 13.5-18 × 7.5-9.5µm, epispore with fine or coarse warts. Apothecia 0.3-0.8mm diam. _Saccobolus obscurus_ - Spore clusters elongated, 28-37 × 10-13µm. Spores 10-14.5 × 5-7.5µm, epispore smooth or very finely granular. Apothecia 0.1-0.3mm diam. _Saccobolus depauperatus_ 77(4) Asci operculate or bursting, without a subapical ring. Spores ellipsoid. 78 - Apothecia white, often minutely hairy at the margin. Ascus dehiscing by a vertical slit; the slit is prevented from running right down the ascus by a subapical ring of thickening. Spores ellipsoid-fusiform. (_Ascozonus_, figs 14, 15) 90 78(77) Asci 16-spored. Spores ellipsoid, 11-16 × 7-10µm. _Coprotus sexdecemsporus_ - Asci more than 16-spored. 79 79(78) Asci 32-spored. 80 - Asci more than 32-spored. 84 80(79) Asci very large, nearly 0.5mm long, spores 30-35 × 13-17µm (32-40 × 20-24µm in Kimbrough, 1969). Apothecia pale coloured. _Thecotheus pelletieri_ - Asci and spores smaller. 81 81(80) Spores 10µm or longer. 83 - Spores up to 10µm long. 82