Rhizome long creeping, 10-16 cm, robust, 1-2 cm in diam., with 2-4 rows of fronds, densely scaly; scales dark brown or blackish, lanceolate, 4-6 mm, subclathrate. Fronds close together; sterile fronds pinnate, 55-145 cm; stipe 40-60 cm, near base ca. 8 mm in diam., sparsely scaly, with 7-16 vascular bundles; lamina gray-green when dry, elliptic, 60-85 × 30-45 cm, widest somewhat below middle, hard herbaceous; pinnae 12-20 pairs, alternate, linear-lanceolate, usually widest at (to below) middle, 15-25 × 2-3 cm, base ± symmetrical, broadly attenuate or truncate, margin slightly serrate-crenate, with a short spine in each sinus, apex acuminate, lowermost 2 pinnae with short stalk; terminal segment joined to rachis, usually narrowly triangular, ± similar to central pinnae, 10-20 cm, bulbil subterminal; rachis not winged; secondary veins prominent; veins forming a costal areole and 3 rows of distal areoles, without included free veinlets. Fertile fronds 50-150 cm; stipe 30-85 cm; lamina 70-90 × 15-25 cm; pinnae 80-120 × 5-8 mm. Sporangia inserted usually throughout abaxial surface, arrangement fully acrostichoid, sometimes with a sterile strip along costa.
More
Sterile fronds pinnate, 55-150 cm long; lamina index 1-3, 30-90 by 20-45 cm, terminal segment 8-25 cm long, (firm) herbaceous, usually light to dark green, sometimes with a purple tinge; pinnae 20-50, index 5-12, the central part usually with parallel margins, 11-30 by 2-3(-5) cm, base ± symmetrical, acute, broadly attenuate or truncate, margin usually slightly serrate-crenate, sometimes lobed to ⅓ to the costa and with a short or inconspicuous spine in each sinus; terminal segment usually narrowly triangular, sometimes ± conform to the central pinnae; venation pattern: veins forming a costal areole and one to several rows of distal areoles, included free veins absent, the veins in the marginal strip excurrent and parallel; see Fig. 27a. Fertile fronds 55-160 cm long; pinnae index (6-)9-20, 5-23 by 0.4-1.7 cm. Sporangia situated usually all over the lower surface, sometimes with a sterile strip along the costa. Spores smooth, undulate.
Home
