1	Basidiocarps sequestrate (either secotioid or gasteroid), basidiospores statismosporic	2
–	Basidiocarps agaricoid, basidiospores ballistosporic	4
2	Basidiocarps secotioid, the margin of the pileus does not break free from the stipe, hymenophore (gleba) labyrinthiform to sub-lamellate	C. agaricoides
–	Basidiocarps gasteroid, stipe absent or rudimentary with a thick whitish mycelial cord, gleba crossed by a columella and capillitium	3
3	Columella not fully developed; basidiospores 7–12 µm in diam	C. arizonicum
–	Columella well-developed, reaching halfway up the basidiocarp; basidiospores 10–14(–15) × 10–13(–14) µm	C. lusitanicum
4	Basidiocarps overall white; basidiospores without germ pore, with rounded apex	5
–	Basidiocarps with distinct dark brown patches and squamules; basidiospores with germ pore; apex truncated	9
5	Basidiospores subglobose to globose; cheilocystidia clavate to broadly clavate	6
–	Basidiospores ellipsoid; cheilocystidia subcylindric to slightly fusiform	7
6	Spore print greyish-green, known from the palaeotropical regions	C. palaeotropicum
–	Spore print white, known from temperate region in Northern China	C. sphaerosporum
7	Basidia 2-spored; widely distributed in Africa, America and Asia	C. hortense
–	Basidia 4-spored; known from palaeotropics	8
8	Pileus with obvious umbo, basidiospores measuring (7.5) 8.0–10.5 (12.5) × (5.0) 5.5–7.0 (7.5), known from Southeast Asia	C. demangei
–	Pileus without obvious umbo, basidiospores (7.5) 8.0–9.0 × (5.5) 6.0–6.5(7.0) μm), known from South Africa	C. africanum
9	Basidiospores less than 10 µm long; terminal elements of pileipellis cylindrical, basidiocarps grown in bamboo forest in east Asia or under oaks of Florida in south-eastern U.S.A	10
–	Basidiospores longer than 10 µm; terminal elements of pileipellis clavate to narrowly clavate; basidiocarps in various habitats (meadows, pastures, lawns, greenhouse, natural forests)	11
10	Cheilocystidia clavate, without apical excrescences; clamp connections present at base of basidia and cheilocystidia; distributed in Asia	C. neomastoideum
–	Cheilocystidia clavate, some mucronate or with apical excrescences; clamp connections absent at base of basidia and cheilocystidia; distributed in North America	C. subrhacodes
11	Spore print green; lamellae completely greenish with age	C. molybdites
–	Spore print white or off-white; lamellae whitish or brownish with age, never totally green; sometimes a bluish-green shade is present near the stipe	12
12	Cheilocystidia sphaeropedunculate to broadly clavate, often catenate	13
–	Cheilocystidia narrowly clavate to clavate	14
13	Pileus squamules of similar colour as background, olivaceous brown to greyish-brown	C. olivieri
–	Pileus squamules brown (different shades) on white to cream background, which is distinctly paler than squamules	C. rhacodes
14	Clamp connections absent at base of basidia and cheilocystidia, cheilocystidia clavate to fusiform; annulus relatively simple	C. nothorhacodes
–	Clamp connections present at base of basidia and cheilocystidia, cheilocystidia narrowly clavate to fusiform; annulus relatively simple or complex	15
15	Basidiocarps with abruptly to marginately bulbous stipe base; annulus relatively simple, without a double crown, but with a tough brown patch on the underside	C. brunneum
–	Basidiocarps with widened base of stipe, but not abruptly so; annulus complex, with double crown	16
16	Spore print yellowish-white to pale yellow to greyish-green, basidiospores greenish-white, 8–11 × 5–6 (7) µm	C. globosum
–	Spore print white, basidiospores hyaline, 10–10.7 (11) × (7) 8–8.5 (9.5) µm	C. pseudoglobosum