1	Spores very pale, nearly hyaline in 5% KOH	2
–	Spores pale yellow-brown, greyish-brown or darker	7
2	Spores mostly less than 7.0 μm	3
–	Spores up to 8.0 μm	4
3	Spores broader, Q = 1.2–1.6, lamellae brown at maturity	C. eurysporus
–	Spores slenderer, Q = 1.4–1.8, lamellae pale coffee at maturity	C. subminutisporus
4	Surface of pileus is sulcate-tuberculose, up to two-thirds of the radius	C. sulcatotuberculosus
–	Not as above	5
5	Pileus less than 10 mm wide, lamellae brown	C. aberdarensis
–	Not as above	6
6	Basidiomata stout, spores up to 5.5 μm broad	C. singeri
–	Basidiomata slender, spores up to 4.5 μm broad	C. subsingeri
7	Spores up to 11 μm, growing on plant debris in brackish water	C. halophilus
–	Not as above	8
8	Germ pore distinct	9
–	Germ pore indistinct	10
9	Margin of lamellae with abundant pyriform cells, utriform cheilocystidia very rare	P. lacuum
–	Not as above	C. subcacao
10	Cheilocystidia ventricose to broadly lageniform	C. cacao
–	Cheilocystidia saccate to ellipsoid	P. cordobaensis