55(54) Cap pinkish ochraceous to tawny-buff. Lacking facial cystidia. _Panaeolus speciosus_ - Cap whitish or slightly yellowish. With facial cystidia. _Panaeolus antillarum_ 56(50) Gills with facial cystidia often containing yellow amorphous material when seen in ammonia solution or deep blue with cotton blue. (_Stropharia_) 57 (Blue-green _S. cyanea_ & _S. aeruginosa_ often occur in rich garden soils). - Gills lacking facial cystidia. Never with yellowing cystidia in ammonia. (_Psilocybe_) 58 (Red-capped _P. aurantia_ can be found on straw/mulch mixtures in gardens). 57(56) Cap sticky, semi-globate ± expanding at maturity. On raw dung. _Stropharia semiglobata_ - Cap plano-convex, often broad with a central umbo, margin flaring with age. On dungy mixtures in gardens. _Stropharia stercoraria_ 58(56) Stipe bluing, with ring. Spores ellipsoid, 11-14 × 6.5-7.5µm. Fruit body with mealy smell and taste. _Psilocybe fimetaria_ - Stipe lacking distinct ring, or if with ring or ring zone 2-spored and/or stem not bluing. Fruit body without mealy smell and taste. 59 59(58) Stem always with distinct ring. Basidia 2-spored. Spores 15-20µm long. _Psilocybe luteonitens_ - Stem with or without ring. Basidia 4-spored. If with ring, spores smaller. 60 60(59) With ring zone. 61 - Lacking velar remnants on stem, or only appendiculate teeth at cap margin. 62 61(60) Spores slightly angular/limoniform, 11-13(14) × 7-8µm. Often on sewage sludge. _Psilocybe merdaria_ - Spores 13-14 × 7.5-8.5µm. _Psilocybe moelleri_ 62(60) Spores 14-20 × 8-10µm. _Psilocybe subcoprophila_ - Spores smaller. 63 63(62) Spores lentiform, angled, 6-8(8.5) × 4.5-5.5 × 3.75-4.5µm. _Psilocybe bullacea_ (_P. crobula_, occasional on dung, differs in lacking purple colour in gills, and slightly smaller, ovoid, not angular, spores). - Spores larger. 64