1. Hyphal system monomitic....................................................................................................................... W. nigrolimitata Jia J. Chen

1. Hyphal system dimitic or trimitic.......................................................................................................................................................2

2. Generative hyphae without clamp connections..................................................................................................................................3

2. Generative hyphae with clamp connections.......................................................................................................................................4

3. Basidiocarps without rhizomorphs......................................................................................... W. casuarinicola Y.C. Dai & B.K. Cui

3. Basidiocarps with rhizomorphs............................................................................................................................ W. rubella Y.C. Dai

4. Basidiospores> 5.3 µm long.................................................................................................................................................. W. lenta

4. Basidiospores <5.3 µm long..............................................................................................................................................................5

5. Skeletal hyphae indextrinoid..............................................................................................................................................................6

5. Skeletal hyphae dextrinoid.................................................................................................................................................................9

6. Gloeocystidia present............................................................................................................................................... W. austrosinensis

6. Gloeocystidia absent...........................................................................................................................................................................7

7. Basidiospores> 4.5 µm long.............................................................................................................. W. campbelli (Berk.) Ryvarden

7. Basidiospores <4.5 µm long..............................................................................................................................................................8

8. Basidiospores> 2.6 µm wide.................................................................................................................... W. cinnamomea Ryvarden

8. Basidiospores <2.6 µm wide......................................................................................................................... W. aurantipora T. Hatt.

9. Gloeoplerous hyphae present...........................................................................................................................................................10

9. Gloeoplerous hyphae absent.............................................................................................................................................................13

10. Cystidia present............................................................................................................................. W. biennis Jia J. Chen & B.K. Cui

10. Cystidia absent..................................................................................................................................................................................11

11. Tramal skeletal hyphae> 2 µm in diam...........................................................................................................................................12

11. Tramal skeletal hyphae <2 µm in diam..................................................................................................................... W. subavellanea

12. Pore 1–2 per mm; pore surface pale orange to greyish brown....................................................................... W. labyrinthina T. Hatt.

12. Pore 2–4 per mm; pore surface cream to buff-yellow......................................................................................... W. borealis Y.C. Dai

13. Skeletal hyphae absent in the context.................................................. W. ochrocrocea (Henn. & E. Nyman) A. David & Rajchenb.

13. Skeletal hyphae present in the context.............................................................................................................................................14

14. Basidiospores> 3.2 µm wide................................................................................................... W. unguliformis Y.C. Dai & B.K. Cui

14. Basidiospores <3.2 µm wide...........................................................................................................................................................15

15. Skeletal hyphae smooth....................................................................................................................................................................16

15. Skeletal hyphae encrusted................................................................................................................................................................17

16. Basidiocarps annual; tramal skeletal hyphae 2–4 µm in diam..................................................... W. africana I. Johans. & Ryvarden

16. Basidiocarps perennial; tramal skeletal hyphae 4–8 µm in diam.................................................................................... W. tropicalis

17. Generative hyphae with both clamp connections and simple septa; cystidioles absent.................. W. gillesii A. David & Rajchenb.

17. Generative hyphae only with clamp connections; fusoid cystidioles present.................................................................. W. japonica