Pronephrium clemensiae var. degenerum (Christ) Holttum, comb. nov.
- ≡Dryopteris canescens var. degenera Christ in Philip. J. Sci. 2: Bot. 199. 1907
- ≡Phegopteris canescens var. degenera (Christ) v.A.v.R., Handb.: 507. 1908
- ≡Cyclosorus degener (Christ) Copel., Fern Fl. Philip.: 356. 1960
- ≡Thelypteris degenera (Christ) Reed in Phytologia 17: 271. 1968
- Unknown type category: Luzon, Montalban, Mar 1906, Loher s.n.