| 1 | Base of stipe clothed with dark red spreading hairs 30-50 mm long; hairs of under-coat pale, slender or flaccid, much shorter. |
| 1' | Base of stipe clothed mainly with soft matted red-brown hairs, with or without a smaller number of stout rigid dark red hairs. |
| 2 | Hairs of under-coat of stipe-base, and most hairs on lower surface of pinna-rachis and costae, pale, slender, rigid, spreading, not flaccid. Spores smooth |
| 2' | Hairs of under-coat of stipe-base, and smaller hairs on lower surface of pinna-rachis (in some cases also of costa) short, pale, flaccid, their lateral walls collapsed. Spores verrucose. |
| 3 | Hairs on costae almost all flaccid, pale, ± antrorse, matted |
| 3' | Hairs on costae mostly rigid, each cell evenly cylindrical. |
| 4 | Hairs on costae: some flaccid, some spreading, mostly pale |
| 4' | Hairs on costae ascending, mostly dark red |
| 5 | Some stout rigid spreading dark red hairs present near base of stipe, and scattered also on pinna-rachis; pinna-rachis mainly clothed with a close layer of pale matted flaccid hairs. |
| 5' | No stout rigid spreading dark red hairs mixed with softer hairs on stipe-base. |
| 6 | Pinna-rachis rather dark and +- glabrescent; costae bearing flaccid pale hairs +- mixed with thicker dark hairs with pale bases |
| 6' | Pinna-rachis brown, persistently hairy beneath; costae bearing entirely pale flaccid hairs. |
