161. Dryopteris diacalpe Li Bing Zhang, Taxon. 61: 1210. 2012.
红腺鳞毛蕨 hong xian lin mao jue
Diacalpe chinensis Ching & S. H. Wu, Acta Phytotax. Sin. 21: 376. 1983.
Rhizome short, erect, 1-1.5 cm in diam., apex densely covered with dark brown scales; scales lanceolate, 1-1.5 cm, thickly membranous, entire, acuminate. Fronds tufted; stipe stramineous or castaneous, 25-40 cm, middle 2.5-3.5 mm in diam., densely covered with ovate-lanceolate and dark brown scales; lamina dark brown when dry, ovate, 35-40 × 22-30 cm, quadripinnatifid, papery, with salmon pink glands abaxially, sparsely covered with brown, short nodose hairs adaxially, apex acuminate; pinnae 14-18 pairs, basal ones opposite, 6-7.5 cm apart, with short stalk 0.8-1.2 cm, upper ones close together, basal pair largest, triangular-lanceolate, 18-20 × 9-11 cm, tripinnatifid, base nearly truncate, apex acuminate; pinnules 15-18 pairs, alternate, anadromous, with short stalk 2.5-4 mm, 2-3 cm apart, first basiscopic pinnules usually enlarged, lanceolate, 5.5-7 × 2-2.7 cm, bipinnatifid, base truncate, apex acute; ultimate pinnules 10-12 pairs, basal ones opposite, alternate upward, with short stalk ca. 1 mm, distant, narrowly elliptic, 1.2-1.5 × 0.6-0.8 cm, pinnatipartite to ultimate rachis, apex rounded, with 3-4 short teeth; lobes 4 or 5 pairs, distant, elliptic, 3-5 × 1.5-2 mm, undulate or lobed on both sides, undulate and obtuse at apex; rachis and rachillae brown, stramineous, sparsely covered with brown and small scales and bristly curly nodose hairs; veins obvious abaxially, brown, pinnate on lobes, veinlets simple, submarginal. Sori globose, ca. 1.5 mm in diam., 1 in each ultimate pinnule or lobe, dorsal on basal acroscopic veinlets; indusium brown, leathery, dehisced into 2 or 3 irregular valves from top when mature; spores narrowly elliptic.
● On rocks, dense forests; 2000-2400 m. Sichuan, Yunnan.
Dryopteris diacalpe is characterized by having large sori and is similar to D. pseudocaenopteris but differs by its pinnae not having ruby glands abaxially.