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

23. Arachniodes japonica (Sa. Kurata) Nakaike, Enum. Pterid. Jap., Filic. 188. 1975.

缩羽复叶耳蕨 suo yu fu ye er jue

Arachniodes chinensis (Rosenstock) Ching var. japonica Sa. Kurata, J. Geobot. 13: 99. 1965; A. gradata Ching; A. nanqingensis Ching; A. reducta Y. T. Hsieh & Y. P. Wu.

Rhizome shortly creeping, stiff, densely scaly; scales dark or reddish brown, linear-lanceolate or subulate, ca. 10 × 0.5-1.5 mm, firmly membranous and spreading, apex threadlike. Fronds contiguous, 65-95 cm; stipe stramineous, 30-50 cm, 2-3 mm in diam., base with scales similar to those on rhizome, upward with sparse appressed brown subulate and remotely denticulate-based scales; lamina 2- or 3-pinnate, green when dried, ovate-oblong, 35-45 × 24-30 cm, thinly or firmly papery, base rounded, apex acuminate, rachis scaly as distal portion of stipe; pinnae 8-10 pairs, alternate or lower 1(-3) pairs opposite, with to 2 cm stalk, (obliquely) spreading, contiguous or imbricate; lowest pinnae deltoid-lanceolate, ca. 17 × 7 cm, base rounded-cuneate, apex (long) acuminate; primary pinnules ca. 17 pairs, shortly stalked, imbricate, basal 1 pair as long as or shorter than distal pairs (ca. 5 × 1.9 cm), lanceolate, base acroscopically truncate, basiscopically cuneate, apex acuminate; secondary pinnules sessile, contiguous, oblong, apex acute or obtuse, margin dentate, aristate; upper pinnae slightly falcate; axes and veins of ultimate segments with dense minute brown subulate and denticulate-based scales abaxially. Sori terminal on ultimate veinlets, 1-6 pairs per ultimate segment, medial between midvein and margin or closer to midvein; indusia brown, membranous, lacerate or denticulate.

Forests; 300-800 m. Fujian (Nanjing), S Zhejiang [Japan].


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