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FOC | Family List | FOC Vol. 2-3 | Dryopteridaceae | Dryopteris

158. Dryopteris christensenae (Ching) Li Bing Zhang, Taxon. 61: 1209. 2012.

离轴鳞毛蕨 li zhou lin mao jue

Diacalpe christensenae Ching, Bull. Fan Mem. Inst. Biol., n.s., 1: 291. 1949.

Rhizome short, erect, 1-1.5 cm in diam., apex densely covered with dark red scales; scales ovate-lanceolate, 0.5-0.7 cm, membranous, entire, acuminate. Fronds tufted; stipe 40-45 cm, base 2.5-3.5 mm in diam., dark brown, densely covered with scales same as on rhizome, smaller upward; lamina dark green when dry, ovate to oblong, 25-35 × 20-23 cm, quadripinnatifid, papery, with salmon pink glands abaxially, sparsely covered with brown, short nodose hairs adaxially, apex acuminate; pinnae 18-20 pairs, opposite, basal ones with short stalk 1-1.8 cm, 5-7 cm apart from second pair, upper ones 3-4 cm apart, sessile, basal pair largest, 12-16 × 9-11 cm, triangular-lanceolate, tripinnatifid, base nearly truncate, apex acuminate; pinnules 17-20 pairs, alternate upward, anadromous, with short stalk 0.5-1 mm, 1.5-2 cm apart, basiscopic 1 or 2 pinnules usually enlarged, 7-9 × 2-3.5 cm, lanceolate, bipinnatifid, base truncate, apex acuminate; ultimate pinnules 16-20 pairs, basal 1 or 2 pinnules opposite, alternate upward, with short stalk ca. 1 mm, distant, elliptic, 1.2-2.2 × 0.6-1.1 cm, base asymmetrical, pinnatipartite to ultimate rachis, apex rounded, with 2 or 3 short teeth; lobes 5-7 pairs, distant, elliptic, 3.5-5 × 1.5-2 mm, apex rounded, terminal part subentire or with 2 or 3 teeth; median pinnae narrower, strongly catadromously arranged, basiscopic pinnules slightly contracted and close to rachis, upper pinnules 1-1.5 cm apart to rachis; pinnules of upper pinnae opposite and symmetrical, ultimate pinnules entire or dentate-lobed; rachis and rachillae stramineous, sparsely covered with brown nodose hairs, with dense scales on joint; veins obvious abaxially, brown, pinnate on lobes, veinlets simple, submarginal. Sori globose, ca. 1 mm in diam., enveloped by indusium, 1 in each ultimate pinnule or lobe, dorsal on basal acroscopic veinlets; indusium brown, globose, leathery, dehisced into 2 or 3 irregular valves from top when mature; spores narrowly elliptic.

● Near streams in dense forests; 1800-2500 m. Yunnan.


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