Diplazium walkeri
Rhizome:
Rhizome ascending or erect, incl. stipe-base remnants 2-3 cm thick; scaly but glabrous in older parts.
Rhizome scales:
Rhizome scales basifix, periclinal cell walls very thin and quickly disappearing, often leaving the scale disintegrating into a fibrous, shape, margin, apex of the scales accordingly not observed.
Fronds:
Fronds to c. 130 cm long, bipinnate.
Stipe:
Stipe to c. 46 cm, sparsely scaly at base with scales similar to those on the rhizome, upwards with papillose multicellular protrusions.
Rachis:
Main rachis as the stipe, pinnae and pinnule rachis on the adaxial surface with two flanges interrupted at the vein junctions, on the abaxial surface with flat translucent scales and papillose multicellular protrusions.
Lamina:
Lamina bipinnate, to c. 90 by 50 cm, widest at c. 1/3-1/5, gradually narrowing from c. halfway up.
Pinnae:
Free pinnae 12-15 pairs, lowest 1-6 somewhat reduced, alternate to subopposite, largest pinnae to 2 cm stalked, to 37 by 18 cm;
Pinnule:
Pinnules alternate to opposite, basal 7-10 pairs free, to 5 by 1.5 cm, symmetric at base, incised to 1.5--3 mm from midrib, apex obtuse to acute, lobes truncate
Sori:
Sori on all veins of a vein-group, running from costule to c. 1 mm from the margin, spores c. 50 µm long, very lightly rugulate.
Distribution:
Indonesia: Sulawesi Selatan (Enrekang District, Latimojong Mountains).
Ecology:
From lowland forest to upper montane forest, in deep shade, in ravines or by streams, 1700-2150 m.
Notes:
Diplazium walkeri differs from D. mutabile mainly in the more highly dissected lamina. D.furculicolum differs from both in a much smaller size, basal scales that retain more of their shape and in much more strongly ornamented spores.