Rigidoporus, Murrill, 1905

Gomes-Silva, Allyne Christina, Medeiros, Priscila Sanjuan De, Soares, Adriene Mayra Da Silva, Sotão, Helen Maria Pontes, Ryvarden, Leif & Gibertoni, Tatiana Baptista, 2014, Two new species of Rigidoporus (Agaricomycetes) from Brazil and new records from the Brazilian Amazonia, Phytotaxa 156 (4), pp. 191-200 : 198

Key to the species of Rigidoporus in the Neotropics

1. Basidiomata pileate...................................................................................................................................................... 2

- Basidiomata resupinate ............................................................................................................................................... 13

2. Presence of an umbo that attaches the basidiomata to the substrate...................................................... R. umbonatipes

- Absence of an umbo that attaches the basidiomata to the substrate ............................................................................. 3

3. Basidiomata pale buff to cream, up to 6 cm thick; pores 5 − 6 per mm; basidiospores, 7−10 × 6.5−10 µm ................... ..................................................................................................................................................................... R. ulmarius

- Basidiomata of different colour, up to 1 cm thick; pores> 6 per mm; basidiospores <7 µm long ............................. 4

4. Thick-walled cystidia present ...................................................................................................................................... 5

- Thick-walled cystidia absent ........................................................................................................................................ 8

5. Basidiomata tiny, less than 7 mm wide, pendant ................................................................................... R. micropendulus

- Basidiomata different and larger .................................................................................................................................... 6

6. Basidiomata laterally stipitate................................................................................................................... R. biokoensis

- Basidiomata sessile to dimidiate.................................................................................................................................. 7

7. Pore surface cream to orange, basidiospores ellipsoidal ................................................................................. R. andinus

- Pore reddish to buff when dry, basidiospores globose ..................................................................................... R. lineatus

8. Pore surface bright to deep orange without a reddish tint, basidiomata often large and 0.5 − 2 cm thick at the base, growing in clusters................................................................................................................................... R. aurantiacus

- Pore surface distinctly reddish, basidiomata small to medium, rarely above 1 cm thick ................................................ 9

9. Basidiomata sessile to occasioanally resupinate..................................................................................... R. microporus

- Basidiomata stipitate................................................................................................................................................... 10

10. Basidiospores 6 − 7 µm in diameter ......................................................................................... R. grandisporus sp. nov.

- Basidiospores <6 µm in diameter ............................................................................................................................. 11

11. Basidiomata azonate, ochraceous; context white with black lines; pore surface isabelline; cystidiols 12–15 µm long ................................................................................................................................................................. R. amazonicus

- Basidiomata zonate, diffetent colour; context without black lines, pore surface different colour; cystidiols absent 12

12. Basidiomata cinnamon, fulvous to snuff brown; pore surface fulvous; basidiospores globose 4–6 µm ........................ ........................................................................................................................................................... R. mariae sp. nov.

- Basidiomata first white becoming brown to grey with age or drying; pore surface white; basidiospores globose 3–4 µm .............................................................................................................................................................. R. mutabilis

13. Thick-walled cystidia and cystidiols absent ............................................................................................................... 14

- Thick-walled cystidia and cystidiols present .............................................................................................................. 15

14. Pores 8–10 per mm, turning reddish where bruised; basidiospores 5 − 6 (− 7) × 4 − 6 µm ................. R. sanguinolentus

- Pores 5–7 per mm, not turning reddish when bruised; basidiospores 3.5 − 5.5 × 3.5 − 5 µm ........................ R. crocatus

15. Basidiomata resupinate to efussed-reflexed, pale ochraceous buff to pinkish ochraceous; hyphal system pseudodimitic; basidiospores ovoid to subglobose 4 − 5.5 × 3 − 4 µm ............................................................. R. vinctus

- Basidiomata resupinate, isabelline to beige; hyphal system monomitic; basidiospores globose 5 − 5.5 (− 6) ................. ....................................................................................................................................................................... R. undatus