173(172) Spores smoky brown, broadly ovoid, 9-14 × 6-9µm. Cleistothecial hairs short, up to 30µm. _Thielavia wareingii_ - Spores dark brown, flattened limoniform, 13-16 × 10-13 × 8-9µm. Cleistothecial hairs of two types, some smooth, dark brown, arising from the base up to 3mm long, others greyish green, rough, up to ca 120µm. _Thielavia fimeti_ 174(163) Cleistothecia produced within a common arachnoid mycelial mass. Spores smooth or minutely asperulate, yellow to yellow-brown, broadly ellipsoid, 4-5 × 3-5µm. _Aphanoascus fulvescens_ - Cleistothecia single or gregarious, but not on or in a mycelial mass. 175 175(174) Cleistothecia 170-750µm diam., covered with long (several mm when extended), thick-walled, aseptate, helical appendages. Asci clavate cylindrical, evanescent, 35-62 × 12-21µm. Spores ellipsoid, hyaline, 12-17 × 9-12µm. _Lasiobolidium spirale_ - Cleistothecia without coiled appendages. 176 176(175) Cleistothecia with hairs or appendages. 177 - Cleistothecia smooth. 178 177(176) Cleistothecia black, shining, 100-200µm diam., with dark brown-black thick-walled hairs with hooked tips. Asci 8-15µm diam. Spores straw or copper coloured, ellipsoid, 4-7 × 3.5-4.5µm with de Bary bubble and a germ pore at each end. _Kernia nitida_ - Cleistothecia reddish brown, less than 1mm diam., with long simple appendages curled at the tips. Spores hyaline, oblate, 3.55 × 2-3µm. _Arachnomyces nitidus_ (fig. 50) 178(176) Ascospores globose, larger than 9µm. 179 - Ascospores ellipsoid, up to 9µm. Asci always subglobose. 180 179(178) Ascospores, smooth, 9-13µm. _Orbicula parietina_ (fig. 51) - Ascospores ornamented, 13-24µm Asci subglobose. Cleistothecia ochraceous, becoming yellowish brown or flushed cinnamon. _Roumegueriella rufula_ (fig. 52) 180(178) Ascospores hyaline, then faintly yellowish, minutely spiny, 2.5-3 × 2-2.5µm. Cleistothecia pale, then dark brown. _Aphanoascus stercoraria_ (fig. 53) - Ascospores hyaline, then brown, smooth, 5.5-6 × 3.5-4µm. Cleistothecia dark brown from the beginning. _Pseudeurotium ovale_ (fig. 54) Key 3. Basidiomycota