Diplazium lonchophyllum
Diplazium
Diplazie à feuilles allongées, lanceleaf twinsorus fern
twin-sorus fern
ascending to erect;
scales dark brown, ovate to lanceolate, margins dentate.
creeping, ascending, or erect, stolons absent.
monomorphic, evergreen or dying back in winter.
15–45 cm.
ca. 1/2 to equaling length of blade, base swollen and persisting as trophopod over winter or not;
vascular bundles 2, lateral, lunate in cross section.
deltate-lanceolate, pinnate-pinnatifid, 20–36 × 8–22 cm, broadest at or just above base, acuminate at apex.
oblong-lanceolate to deltate, 1-pinnate to 2-pinnate-pinnatifid [simple to 4-pinnate-pinnatifid], gradually reduced distally to pinnatifid apex or apical pinna similar to (conform) adjacent pinnae, herbaceous to papery.
lanceolate-oblong, inequilateral, base cuneate basiscopically, truncate acroscopically, apex acuminate, lobed halfway or more toward costa;
basal acroscopic segments of basal pinnae free, margins serrate.
not articulate to rachis, segment margins entire, crenulate, or serrate;
proximal pinnae not reduced, sessile, equilateral or inequilateral;
costae adaxially deeply grooved, grooves continuous with that of rachis;
indument abaxially absent or of linear to ovate scales, adaxially absent.
pinnate, lateral veins simple or sometimes forked.
free, simple or forked, or basal pairs of adjacent segments anastomosing.
elongate, straight, single or double, indusiate;
indusia vaulted, thin, erose.
single or paired back-to-back on veins, oblong to linear, straight or slightly falcate;
indusia linear, laterally attached, persistent.
brownish, usually broadly winged.
= 40, 41.
Diplazium lonchophyllum
Diplazium
Central and South American species closely related to Diplazium lonchophyllum, including D. cristatum (Desrousseaux) Alston, D. drepanolobium A. R. Smith, and D. werckleanum H. Christ, are in need of monographic work (R. G. Stolze 1981; A. R. Smith 1981; J. T. Mickel and J. M. Beitel 1988).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
In a few species outside the flora, rachises and costae bear multicellular hairs like those of Deparia, which differs from Diplazium in having grooves of costae not decurrent onto rachis groove, veins free or anastomosing, sori long or short and costular, and indusia present or absent. Many species of Diplazium are known to reproduce apogamously.
Species about 400 (3 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Leaves 2-pinnate; veins anastomosing. | D. esculentum |
1. Leaves 1-pinnate or 1-pinnate-pinnatifid; veins free. | → 2 |
2. Scales brown, entire; pinnae nearly entire. | D. pycnocarpon |
2. Scales dark brown, dentate; pinnae lobed. | D. lonchophyllum |
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