Woodwardia japonica (L.f.) Sm.

Family

Blechnaceae

Nomenclature

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.

Description

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.

Wider Distribution

Korea, Japan, China, Taiwan and Vietnam.

Ecology

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).

Habit

Habit

Habit

Habit

Rhizome

Rhizome

Scales on rhizome

Scales on rhizome

Base of stipes

Base of stipes

Cross section through stipe

Cross section through stipe

Scales on stipe

Scales on stipe

Apex of lamina

Apex of lamina

Young lamina

Young lamina

Rachis and bases of pinnae

Rachis and bases of pinnae

Lower surface of lamina

Lower surface of lamina

Upper surface of lamina

Upper surface of lamina

Venation

Venation

Sori

Sori

Site hosted by the Royal Botanic Garden Edinburgh. Content managed by Stuart Lindsay, Gardens by the Bay, Singapore and David Middleton, Singapore Botanic Gardens. Last updated 16 November 2016.