1. Basidiospores < 8 μm in length	2
1. Basidiospores > 8 μm in length	5
2. Pores 7–9 per mm	3
2. Pores < 6 per mm	4
3. Cystidioles absent	H. nanosporus
3. Cystidioles present	H. microsporus
4. Pores1–3 per mm; skeletal hyphae dextrinoid	H. brasiliensis
4. Pores 4–5 per mm; skeletal hyphae non-dextrinoid	H. odorus
5. Pores 5–7 per mm	6
5. Pores < 5 per mm	7
6. Skeletal hyphae dextrinoid; dendrohyphidia absent	H. septatus
6. Skeletal hyphae non-dextrinoid; dendrohyphidia present	H. bicolor
7. Basidiocarps pileate	H. pileatus
7. Basidiocarps resupinate	8
8. Pores 2–3 per mm	9
8. Pores > 3 per mm	13
9. Hyphal system trimitic; skeletal hyphae dextrinoid	H. tuberculosus
9. Hyphal system dimitic; skeletal hyphae non-dextrinoid	10
10. Basidiospores < 16 μm in length	11
10. Basidiospores >16 μm in length	12
11. Basidiospores ellipsoid to short cylindrical, <12 μm in length	H. nepalensis
11. Basidiospores oblong ellipsoid, >12 μm in length	H. gilbertsonii
12. Dendrohyphidia absent	H. latisporus
12. Dendrohyphidia present	H. longisporus
13. Basidiocarps perennial	14
13. Basidiocarps annual	16
14. Skeletal hyphae dextrinoid	H. srilankensis
14. Skeletal hyphae non-dextrinoid	15
15. Pore surface light reddish brown when dry; basidiospores ellipsoid	H. subtrameteus
15. Pore surface clay-buff when dry; basidiospores cylindrical	H. thindii
16. Cystidioles absent	H. cylindrosporus
16. Cystidioles present	17
17. Skeletal hyphae dextrinoid	18
17. Skeletal hyphae non-dextrinoid	21
18. Basidiospores broadly ellipsoid, >5 μm in width	19
18. Basidiospores oblong ellipsoid or cylindrical to slightly allantoid, <5 μm in width	20
19. Cystidioles fusiform without apically simple septa	H. papyraceus
19. Cystidioles slim clavate with apically simple septa	H. subpapyraceus
20. Basidiospores oblong ellipsoid	H. angustisporus
20. Basidiospores cylindrical to slightly allantoid	H. punctatus
21. Hyphae at dissepiment edge non-septate	H. alabamae
21. Hyphae at dissepiment edge with a simple septum	22
22. Basidia thick-walled; basidiospores > 7 μm in width	H. crassus
22. Basidia thin-walled; basidiospores < 7 μm in width	H. pirongia