Rhizome erect to suberect, up to 80 mm long, up to 7 mm in diam., with stipe bases and scales; scales castaneous to ferruginous, often with a slightly darker central region, lanceolate, up to 9 x 2.2 mm. Fronds erect, up to 1.84 mm long, arching, up to 12 per plant. Stipe firm, proximally castaneous, stramineous to greenish distally, up to 980 mm long, up to 8 mm in diam., proximally adaxially flattened, sulcate distally, proximally sparsely set with scales similar to, but slightly larger than those on rhizome, glabrous distally. Lamina oblong-ovate, up to 860 x 630 mm, 2-pinnate, with up to 17 pinna pairs. Rachis stramineous to yellow, adaxially sulcate, glabrous. Pinnae opposite to alternate, basal pair largest, with up to 3 pinnules basiscopically, strongly inequilaterally triangular, up to 340 x 205 mm, distal pinnae oblong-acuminate, pectinately lobed; pinna rachis, costa and costules adaxially with prickles up to 2.2 mm long; petioles up to 17 mm long. Pinnules sessile, basiscopically decurrent, pectinate, up to 195 x 70 mm; lobes herbaceous, linear-obtuse, up to 45 x 4 mm, entire; terminal lobe often elongated, linear-attenuate, up to 47 x 3.5 mm, entire to repand; costa adaxially with prickles up to 0.6 mm long where veins branch from the costa; venation free, forked once. Sori linear, continuous along proximal part of lobes, along a near-marginal vascular commissure; receptacle paraphysate. Indusium firm, linear, up to 15 x 0.4 mm, entire.
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Rhizome erect to procumbent, set with linear-attenuate, atrocastaneous rhizome-scales c. 3.5 mm long with pale ciliate margins. Fronds tufted herbaceous, arching; stipe stramineous, tending to castaneous basally, up to 0.9 m long, smooth or set with slender spines, glabrous except for basal scales; lamina oblong-ovate, up to 0.9 x 0.6 m, 3-pinnatifid, lower pinnae much-developed basiscopically; upper pinnae very narrowly oblong, acute, glabrous on both surfaces but with spines on costae and costules above and with or without slender spines on costae below; ultimate lobes linear to broadly linear, obtuse, decurrent; veins free; rhachis sulcate, stramineous, glabrous, smooth or spiny. Sori in marginal lines; indusium erose, membranous.
Rhizome erect to procumbent, set with atrocastaneous rhizome scales. Costules, as well as costae, spinous above. Sterile apices of fertile and sterile lobes entire. Sori in marginal lines.
Varietal description as for P catoptera var. catoptera, but variously set with short prickles abaxially on the stipe, rachis, pinna-rachis and costae.
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