Cyrtomium
Asiatic holly fern, holly fern, netvein hollyfern
erect or ascending, stolons absent.
monomorphic, evergreen.
± 1/2–3/4 length of blade, base not swollen;
vascular bundles more than 3, arranged in arc, ± round in cross section.
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.
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.
elaborately anastomosing, areoles formed with 1–3 included veinlets.
peltate, persistent or caducous.
in 2 or more rows between midrib and margin, round.
brown, with inflated folds or wings.
= 41.
Cyrtomium
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).
Etymology: Greek cyrtoma, arch, for the arched veins
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Pinnae 4-10(-12) pairs, leathery, shiny adaxially, margins sometimes undulate or coarsely dentate, but not minutely crenulate or denticulate. | C. falcatum |
1. Pinnae (8-)10-25 pairs, papery, not shiny adaxially, margins minutely crenulate-denticulate. | fortunei var. fortunei |
CA
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