Cyathea subgen. Hymenophyllopsis

Christenhusz, Maarten J. M., 2009, New combinations and an overview of Cyathea subg. Hymenophyllopsis (Cyatheaceae), Phytotaxa 1, pp. 37-42 : 42

Key to the species of Cyathea subgen. Hymenophyllopsis

This key is adapted from Lellinger (1984).

1 Blades 22–27 cm long; rachises villous, with shiny translucent hairs ............................................. C. trichomanoides

- Blades to 20 cm long, usually less than 15 cm; rachises glabrous, scaly or sparsely hairy ........................................ 2

2 Rhizome and petiole scales 7–10 mm long, linear, forming a tuft at the rhizome apices ........................................... 3

- Rhizome and petiole scales 1.5–5 cm long, lanceolate or narrowly lanceolate, not forming a conspicuous tuft at the rhizome apices .............................................................................................................................................................. 4

3 Lamina triplipinnate; stipes and rachises with variable contorted hair-like scales .................................. C. ctenitoides

- Lamina pinnate-pinnatifid, the lower pinnae, sometimes more dissected; stipes and rachises with short catenate hairs ................................................................................................................................................................ C. universitatis

4 Soral valves narrowly lacerate; petiole 0.2–0.5 mm in diameter.................................................................................. 5

- Soral valves broadly lacerate, repand, lobed or subentire; petiole (0.5–) 0.7–1.0 mm in diameter ............................. 6

5 Blades tripli- to quadripinnate; ultimate segments to ca 0.5 mm wide........................................ C. hymenophylloides

- Blades bi- to tripinnate; ultimate segments ca 0.7–1 mm wide .................................................................. C. incognita

6 Blades pinnate-pinnatifid to bipinnate; soral valves broadly lacerate .................................................. C. asplenioides

- Blades bi- to triplipinnate-pinnatifid; soral valves repand or subentire, sometimes triangularly lobed ....................... 7

7 Rhizomes, petioles and rachises with slightly dentate, dull, straminaceous, 2–5 mm long scales ................ C. dejecta

- Rhizomes, petioles and rachises with entire, glossy, brown, 1.5–2 mm long scales .................................. C. tepuiana