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FOC | Family List | FOC Vol. 2-3 | Athyriaceae | Athyrium

64. Athyrium obtusilimbum Ching, Acta Bot. Boreal.-Occid. Sin. 6(1): 11. 1986.

钝顶蹄盖蕨 dun ding ti gai jue

Rhizomes erect, apex densely clothed with brown, linear-lanceolate scales. Fronds caespitose; fertile fronds 48-100 cm; stipe blackish brown at base, upward stramineous, 22-44 cm, up to 4 mm in diam. at base, base similarly densely scaly, upward with sparse small scales; lamina 2-pinnate, oblong or ovate-oblong, 28-54 × 18-36 cm, base slightly narrowed, apex somewhat abruptly narrowed; pinnae 7-9 pairs below abruptly narrowed tip, basal 1 or 2 pairs of pinnae subopposite, upper pinnae alternate, subspreading or ascending, with short stalk 1-2 mm or sessile, basal pinnae slightly shortened, narrowed to base; middle pinnae narrowly lanceolate or linear-lanceolate, 9-22 × 2.8-4.8 cm, base subequilateral, truncate and parallel to rachis on acroscopic side, broadly cuneate on basiscopic side, pinnate, apex long acuminate or somewhat caudate; pinnules 10-25 pairs, basal pinnules subopposite, upper pinnules alternate, spreading, shortly stalked or sessile, narrowly oblong, 1-2.5 cm × 4-10 mm, base widened, subtruncate, auriculate and parallel to rachis on acroscopic side, broadly cuneate on basiscopic side, decurrent and sometimes adnate to wing of costae, cut to 1/2, apex obtuse-rounded or acute; pinnule segments 4-9 pairs, subsquare, ascending, margin with 2 or 3 small teeth; upper pinnae similar to middle pinnae and gradually smaller, base not narrowed; veins visible on both surfaces, slightly protuberant and pale red-purple abaxially, forked or pinnate in segments. Lamina papery when dried, greenish brown, glabrate on both surfaces; rachis and costae stramineous, with sparse small scales and short hairs abaxially, with subulate spines on adaxial side at base of costa or costule. Sori orbicular-reniform, J-shaped, horseshoe-shaped, or oblong, inframedial on basal acroscopic veins, 1 per segment, biseriate on both sides of costule; indusia brown, orbicular-reniform, J-shaped, horseshoe-shaped, or oblong, membranous, ciliate at margin, persistent. Perispore surface without folds, with reticulate ornamentation, reticulation size unequal.

● Shrub forests; 2500-3400 m. NW Yunnan.


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