A key to Peniophora species in China
1. Dendrohyphidia well-developed, brown	P. versiformis
1. Dendrohyphidia absent, or colorless when present	2
2. Lamprocystidia brown over the entire length	3
2. Lamprocystidia colorless or only brown at the basal part	6
3. Skeletocystidia present	4
3. Skeletocystidia absent	5
4. Basidiospores 10–12.5 × 3.7–4.2 µm	P. tristicula
4. Basidiospores 5.2–7.5 × 2–3.5 µm	P. kuehneri
5. Basidiospores triangular, on palms	P. trignosperma
5. Basidiospores cylindrical to narrowly ellipsoid or ovoid, on angiosperms	P. lassa
6. Dendrohyphidia present, often colorless and may be difficult to see	7
6. Dendrohyphidia absent	8
7. Lamprocystidia absent; basidiospores > 7.5 µm long	P. polygonia
7. Lamprocystidia present; basidiospores < 7.5 µm long	P. meridionalis
8. Basidiospores ellipsoid or ovoid	9
8. Basidiospores cylindrical or allantoid	12
9. Basidiospores ovoid	P. roseoalba
9. Basidiospores ellipsoid	10
10. Generative hyphae with clamps	P. proxima
10. Generative hyphae without clamps	11
11. Basidiospores 9–13 × 6–7 µm	P. cremicolor
11. Basidiospores 11–20 × 8–14 µm	P. erikssonii
12. Basidiomes red	13
12. Basidiomes grey, cream, pale orange, pinkish, yellowish or purplish	14
13. Basidiomes pulvinate, only found on Populus	P. rufa
13. Basidiomes effused, found on other hosts	P. pseudoversicolor
14. Generative hyphae without clamps	15
14. Generative hyphae with clamps	19
15. Basidia with two sterigmata	P. bicornis
15. Basidia with four sterigmata	16
16. Basidiospores > 10 µm long	P. major
16. Basidiospores < 10 µm long	17
17. Basidiospores < 7 µm long	P. malaiensis
17. Basidiospores > 7 µm long	18
18. Basidiomes up to 1.2 mm thick; basidia thick-walled	P. borbonica
18. Basidiomes up to 200 µm thick; basidia thin-walled	P. shenghuae
19. Gloeocystidia indistinct or absent	20
19. Gloeocystidia present	22
20. Basidiomes pinkish, effused-reflexed, usually on Quercus.	P. manshurica
20. Basidiomes greyish, resupinate, on gymnosperms or angiosperms	21
21. Lamprocystidia 40–80 × 6–14 µm; on Juniperus	P. junipericola
21. Lamprocystidia 15–25 × 5–10 µm; on gymnosperms or angiosperms	P. cinerea
22. Gloeocystidia distinctly thick-walled, with walls up to 2–3 µm thick	P. crassitunicata
22. Gloeocystidia thin- to slightly thick-walled, with walls < 1 µm thick	23
23. Lamprocystidia up to 20 µm wide; basidiospores up to 7 µm long	P. pithya
23. Lamprocystidia up to 12 µm wide; basidiospores up to 10 µm long	24
24. Gloeocystidia 30–80 × 8–20 µm; basidiospores 2.5–3.5 µm wide	P. nuda
24. Gloeocystidia 12.5–58 × 5.5–15.5 µm; basidiospores 3–5.5 µm wide	P. yunnanensis