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Pleocnemia
(incl. Arcypteris)
Key ex Holttum 1974, Kew Bull. 29:341; 1951, Reinwardtia 1:193; 1951; Reinwardtia 1:176.
Species in Papuasia
| 1a. | Fronds mostly bipinnatifid apart from basal pinnae, free pinnules, if present, few or attached by short-winged stalks to pinna-rachis; many additional areoles always present besides those along costae and costules | (Arcypteris)
2 |
| Fronds always amply bipinnate; additional areoles few or lacking | (Pleocnemia s.s.)
4 | |
| 2a. | Fronds normally bipinnatifid, the largest sometimes bipinnate near the base; sori scattered irregularly, very abundant | P. irregularis |
| Fronds, at least in the basal part, bipinnate with lobed pinnules; sori arranged in one row on each side of the costules of pinnule lobes | 3 | |
| 3a. | Sori on all veins, +/- midway between the costule and margin, usually distinct | P. macrodonta |
| Sori close to the margin, lacking from basal veins often +/- confluent | P. andaiensis | |
| 4a. | Sori indusiate | 5 |
| Sori exindusiate | 7 | |
| 5a. | Pinnules of middle pinnae lobed c.3/5 towards costule; lobes distinctly falcate with small teeth at ends of veins; sinuses narrow, sinus teeth small but elongate | P. conjugata |
| Pinnules of middle pinnae usually lobed more deeply; sinuses wider, sinus teeth +/- triangular | 6 | |
| 6a. | Pinnules hardly over 2 cm wide, their lobes crenate | P. seranensis |
| Pinnules commonly 2.5-3 cm wide, their lobes lobed, veins in lobules twice-forked | P. cumingiana | |
| 7a. | Pinnules lobed c.2/3 towards costa; lobes entire or at most minutely toothed | P. leuzeana |
| Pinnules lobed more deeply or not; lobes crenate | 8 | |
| 8a. | Pinnules of middle pinnae c. 2 cm wide, lobed 1/2-2/3, lobes hardly falcate, blunt | 9 |
| Pinnules of middle pinnae commonly 3.5-4.5 cm wide, lobed 1-2 mm from costa, lobes distinctly falcate, acute | P. megaphylla | |
| 9a. | Pinnules lobes c.1/2 way to costa | P. dimidilobata |
| Pinnules pinnate at base (at least lower ones) | P. tripinnata |
Note: Holttum (1974) considers that P. dimidilobata includes P. tripinnata