百山祖蹄盖蕨 bai shan zu ti gai jue

Fertile fronds 50-75 cm; stipe upward stramineous, 30-38 cm, ca. 1.5 mm in diam., base clothed with brownish, narrowly lanceolate scales, upward glabrate; lamina 2-pinnate, ovate-lanceolate, 32-42 × 16-20 cm, base slightly narrowed, apex acuminate; pinnae ca. 12 pairs, basal 1(or 2) pairs of pinnae subopposite, upper pinnae alternate, slightly ascending, with stalk ca. 3 mm; basal pinnae slightly shortened, 8-10 × 2.4-3 cm, base slightly narrowed; second basal pinnae lanceolate, 9-11 × 2.6-3.6 cm at base, base broadened, pinnate, apex caudate-acuminate; pinnules 9-12 pairs, alternate, stalked (stalk ca. 1 mm), anadromous, reflexed, ovate-triangular; basal acroscopic pinnules larger, 1.3-2 × 1-1.2 cm, base subequilateral, rounded-cuneate, pinnatipartite nearly to costae, apex acute; pinnule segments 4-6 pairs, suboblong, ascending, with 2 or 3 teeth at apex; veins visible on both surfaces, pinnate in segments, 2 or 3 pairs, oblique, simple. Lamina herbaceous when dried, dark green, glabrate on both surfaces; rachis and costae stramineous, glabrate abaxially, very shortly spiny adaxially. Sori oblong or J-shaped, often covering entire surface of pinnules when mature; indusia brown, oblong or J-shaped, membranous, subentire or somewhat ciliate, persistent. Perispore surface without folds.

● Valley forests; ca. 1000 m. S Zhejiang (Baishanzu, Qingyuan).

Athyrium baishanzuense is very similar to A. devolii but differs by the pinnules ovate-triangular, acute at apex, pinnatipartite nearly to costules, and prominently stalked (stalk ca. 1 mm).