Woodwardia japonica (L.f.) Sm.
Woodwardia japonica (L.f.) Sm., Mém. Acad. Imp. Sci. Turin 6. 411. 1793; P.S.Chiu, Acta Phytotax. Sin. 2: 237–248. 1974; C.E.Devol, Fl. Taiwan 1: 159. 1980; P.H.Hô, Illustr. Fl. Vietnam 1: 259. 1991; K.Iwats., Ferns & Fern Allies of Japan: 156, pl. 89. 1992; Boonkerd & Pollawatn, Pterid. Thailand: 148, 149, 181. 2000; Boonkerd & Pollawatn, Thai For. Bull. (Bot.) 32: 4. 2004. – Blechnum japonicum L.f., Suppl.: 447 (1781).
Woodwardia cochinchinensis Ching, Bull. Fan Mem. Inst. Biol. 2: 7. 1931; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 211. 1940; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 89. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 301, f. 24. 7. 1988; Newman et al., Checkl. Vasc. Pl. Lao PDR: 25. 2007.
Rhizome short, erect, thick, densely covered with large brown scales. Stipes erect, 25–50 cm long, stramineous or faintly pinkish, densely scaly at base; scales softly herbaceous, lanceolate with round base, entire at margin, brown or paler, up to 30 by 4 mm. Frond large, monomorphic, 1-pinnate-pinnatifid. Laminae oblong-lanceolate, truncate or broadly cuneate at base, acute at apex, pinnate with deeply lobed pinnae and distinct apical pinna, 50–90 by 28–40 cm; rachis scaly on upper surface; lateral pinnae 7–25 pairs, straight, linear-lanceolate, gradually narrowing towards acute apex, subtruncate at sessile or very shortly stalked base, deeply lobed 3/4 way towards costa, median pinnae 14–20 by 2–6 cm; apical pinna with more than a dozen serrate segments, wider than the lateral ones, ultimate segment oblong-subdeltoid, moderately acute at apex, slightly dentate at margin, 0.8–2.5 by 0.8 cm, glabrous on both surfaces; row of costal and costular areoles distinct; papyraceous, pale-green, glabrous. Sori oblong, 4–10 on a segment, 2 rows along costules, 2–4 mm long, sunken, covered completely by indusia; indusia membranous, pale brown with thin white margin, toothed .
Distribution in Thailand
NORTHERN: Chiang Mai, Chiang Rai, Nan; NORTH-EASTERN: Loei.
Distribution in Laos
Champasak, Hua Phan, Xieng Khouang.
Korea, Japan, China, Taiwan and Vietnam.
Terrestrial on rather dry slopes in pine forests on humus-rich floor or not so dense evergreen forests at 900–1550 m alt.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
Voucher specimens - Thailand
Middleton et al. 5021, Chiang Mai, c.10 km south of Doi Ang Khang (E); Suvarnasuddhi 23, Nan,Doi Phu Ka (P).
Voucher specimens - Laos
Vidal 1013B, Champasak, Phou Thevada (P); Vidal 1619, Xieng Khouang (P).
Scales on rhizome
Base of stipes
Cross section through stipe
Scales on stipe
Apex of lamina
Rachis and bases of pinnae
Lower surface of lamina
Upper surface of lamina
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