1	Basidiomata resupinate	B. resupinata
–	Basidiomata effused-reflexed to pileate	2
2	Pores < 5 per mm	3
–	Pores > 5 per mm	4
3	Pileal surface white to cream; basidiospores broadly ellipsoid	B. atroalba
–	Pileal surface buff to woody-coloured; basidiospores short cylindrical	B. fumosa
4	Pileal surface white to cream when fresh	5
–	Pileal surface buff to grey when fresh	6
5	Basidiospores subglobose to broadly ellipsoid	B. centroamericana
–	Basidiospores oblong-ellipsoid to ellipsoid	B. albocinerea
6	Crystals present among hymenium	7
–	Crystals absent among hymenium	8
7	Pileal margin dark brown when dry	B. mikrofumosa
–	Pileal margin buff when dry	B. fulgida
8	Basidiospores > 4.5 μm in length	B. adusta
–	Basidiospores < 4.5 μm in length	9
9	Basidiospores 3.1–4.2 × 2–2.8 μm, Q = 1.49–1.53	B. minispora
–	Basidiospores 3.9–4.5 × 2.7–3 μm, Q = 1.43	B. ecuadorensis