Blechnum inflexum (Kunze) Kuhn

Plants terrestrial. Rhizome suberect to erect, to 140 mm long, to 6 mm in diameter, closely set with roots, crowded stipe bases and scales, scales chartaceous, ferrugineous, sessile, subulate, irregularly set with short, retrorse, marginal outgrowths terminating in an enlarged thin-walled cell, apex terminates in an oblong thin-walled cell, to 15 mm long, to 1 mm wide. Fronds crowded, erect to suberect, dimorphic, sterile overtop the fertile, sterile to 440 mm long, fertile to 335 mm long; stipe firm, proximally castaneous, stramineous higher up, adaxially sulcate, sterile to 175 mm long, to 2.5 mm in diameter, fertile to 130 mm long, to 2.5 mm in diameter, proximally densely scaled, sparsely scaled higher up, scales chartaceous, ferrugineous, sessile, subulate, cordate, entire or with a few retrorse outgrowths terminating in an enlarged thin-walled cell, apex terminates in an oblong thin-walled cell, to 23 mm long, to 3 mm wide; lamina pinnatisect, sterile narrowly elliptic to oblong-acute, basal pinnae gradually reduced, to 340 mm long, to 87 mm wide, fertile narrowly obovate to oblong-acute, to 340 mm long, to 35 mm wide, with up to 30 petiolated pinna pairs; rachis adaxially shallowly sulcate, sulcus not open to that of the costae, pronounced adaxially and abaxially, sparsely scaled abaxially, scales sessile, filiform, cuneate to cordate, entire, apex terminates in an oblong thin-walled cell, to 6 mm long, to 0.4 mm wide; pinnae firmly herbaceous, adnate to the rachis, sterile oblong-acute to oblong-obtuse, with an abruptly enlarged base, touching, becoming widely spaced basally, to 46 mm long, to 10 mm wide, fertile linear, closely spaced, to 37 mm long, to 1 mm wide, adaxially and abaxially initially closely set with scales similar to, but shorter than, those on the rachis, glabrous to subglabrous later; costa adaxially convex, pronounced adaxially and abaxially. Venation basally anadromous, catadromous towards the apex, evident, forked, free vein branches terminate near the margin, in the fertile the veins form a near-marginal vascular commissure. Sori linear, extending the entire pinna length; indusium chartaceous, brown, linear, repand, with pluricellular projections, to 1 mm wide; sporangium long-stalked, simple, 3-seriate below the capsule, capsule broadly elliptic in lateral view, with (18-)19(-25) indurated annulus cells, epistomium (5-)7(-10)-celled, hypostomium (5-)7(-8)-celled. Spores elliptic, monolete, with narrow reticulate ridges, (50-)54.7(-62) x (32-)36.2(-46) µm.