Diplazium egenolfioides
Diagnostic description:
Frond 1x pinnate except near apex; rhizome scales dentate, stipe black; main rachis adaxially ridged, ridges interrupted at junction; pinnae free, narrowing from near base to apex, margin incised to ½ or more, apex obtuse.
Rhizome:
Rhizome black, erect, with thick, wiry black roots, bearing up to 5 fronds.
Rhizome scales:
Rhizome scales basifix, to c. 5 by 1 mm, gradually narrowed into a long narrow apex, margin long-dentate with often bifid teeth.
Fronds:
Fronds 1-pinnate except near apex. Scales abundant on abaxial surface rachis but rarer on costae and vein and absent on adaxial side of rachis.
Stipe:
Stipe up to ca. 5 by 0.2 cm.
Rachis:
Rachis black, adaxially channeled with raised cartilaginous ridges decurrent on costae.
Lamina:
Lamina strongly narrowed towards base, to ca. 33 by 10 cm, widest at 1/2 from base, dark-green, paler beneath, drying dark.
Pinnae:
Basal pinnae up to ca. 2 mm, other pinnae up to ca. 1 mm stalked, to ca. 8 by 2 cm, from c. ½-3/4 narrowed towards an obtuse apex, base truncate, margin incised to c. ½ or more, segments with truncate apex, margin dentate.
Sori:
Sori brown present in upper half of lamina and pinnae, mostly on unforked veins, if on forked veins following the acroscopic branch. Indusium pale brown with slightly undulate margin. Spores pale brown, reniform with broad plane median wing (according to Price 1972)
Distribution:
Philippines – Luzon, Laguna Province (Mt. Makiling) and Nueva Vizcaya Province (Mt. Imugan).
Ecology:
In damp or moist forest , in shade upon clay humus and on steep slope, ca. 800 m.
Notes:
Included in the "unusual Diplazia" by Price, but easily recognizable from the others by the deeply dissected pinnae.
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