Cyrtomium
Tent. Pterid. 86. 1836.
Plants terrestrial or on rock. Stems erect or ascending, stolons absent. Leaves monomorphic, evergreen. Petiole ± 1/2–3/4 length of blade, base not swollen; vascular bundles more than 3, arranged in arc, ± round in cross section. Blade oblong-lanceolate, 1-pinnate with pinnae not lobed, distal pinnae only slightly smaller, blade ending in basally lobed pinna ± similar to lateral pinnae, papery or somewhat leathery. Pinnae not articulate to rachis, segment margins crenate to spinulose, sometimes also coarsely dentate; proximal pinnae not reduced, petiolulate, equilateral or somewhat inequilateral with acroscopic base more developed; costae adaxially grooved, grooves continuous from rachis to costae; indument of filiform scales abaxially, absent adaxially. Veins elaborately anastomosing, areoles formed with 1–3 included veinlets. Sori in 2 or more rows between midrib and margin, round. Indusia peltate, persistent or caducous. Spores brown, with inflated folds or wings. x = 41.
Distribution
North America, Asia, Africa including Madagascar, Pacific Islands (Hawaii).
Discussion
This difficult genus requires further systematic study. Estimates of species numbers have ranged from 9 (C. Christensen 1930) to 59 (Shing K. H. 1965). The group might better be considered a subgenus of Polystichum, from which it is poorly differentiated morphologically.
Species ca. 15 (2 in the flora).
Selected References
Lower Taxa
Key
| 1 | Pinnae 4-10(-12) pairs, leathery, shiny adaxially, margins sometimes undulate or coarsely dentate, but not minutely crenulate or denticulate. | Cyrtomium falcatum |
| 1 | Pinnae (8-)10-25 pairs, papery, not shiny adaxially, margins minutely crenulate-denticulate. | Cyrtomium fortunei var. fortunei |