82(81) Spores ellipsoid, with minute scattered warts visible under oil-immersion, 7-9 × 4-4.5µm. Apothecia densely crowded, 90-120µm diam., with 8-13 asci. Asci 32-55 × 16-18µm with (24-)32 spores. Paraphyses 1.5-2µm, clavate to 4-4.5µm. _Thelebolus caninus_ - Spores subacute at apices, ca 6 × 4µm (described as 'minute'; this value is suggested by Boudier's comparison with _R. dubius_, for which measurements are given). Apothecia densely crowded, tawny yellowish-brown. _Ryparobius brunneus_ 83(81) Spores 10-12.5 × 5-7.5µm. Asci clavate, 75-100 × 20-30µm. Paraphyses enlarged to 6µm at apex. _Coprotus albidus_ - Spores 13.5-17.5 × 7-8µm. Asci 10-15 per apothecium, 120-175 × 50-75µm. Paraphyses filiform. _Coprotus rhyparobioides_ 84(79) Asci with up to 64 spores. 85 - Asci with many more than 64 spores--impractical to count. 86 85(84) Asci 64-spored, broad clavate with short stalk, 80-130 × 30-60µm. Spores 8-12 × 4-7µm. _Coprotus niveus_ - Asci broadly clavate with up to 64 spores, 60-100 × 20-30µm. Spores 7-10 × 4.5-5.5µm. Apothecia superficial, on the surface of the substrate, yellowish brown, gregarious, united into a crust. _Thelebolus crustaceus_ 86(84) Apothecia superficial, 400-600µm diam., with prominent, acuminate, superficial, 1-2-septate hairs, 80-190µm long, often roughened towards their apex, with one 1000+-spored ascus, 110-240 × 15-27µm. Spores very variable, 6.5-16 × 3.7-8.8µm (mostly 7.5-13 × 4.5-7µm). _Lasiobolus monascus_ - Apothecia minute, rarely above 350µm diam., globose and immersed in substrate when young. Asci broad globose, with 100-200 spores. Usually only 1-3 asci in each apothecium, which dehisce by bursting at the apex. 87 (Other _Ryparobius_ spp. will key out here [e.g. _R. dubius_, _R. myriosporus_, _R. pachyascus_ and _R. polysporus_]. They all have scattered to gregarious, immersed to semi-immersed apothecia 100-200µm diam., with relatively few asci, each with 100-250 ellipsoid to subacuminate ca 5-7 × 3-4µm spores. There are insufficient modern observations to allow their identification and separation with confidence).