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FOC | Family List | FOC Vol. 2-3 | Polypodiaceae | Leptochilus

9. Leptochilus ellipticus (Thunberg) Nooteboom, Blumea. 42: 283. 1997.

线蕨 xian jue

Rhizome slender, long creeping, 2-10 mm in diam., somewhat flattened; scales dark brown, ovate-lanceolate, 1.1-7.6 × 0.6-2.3 mm, margin sparsely denticulate, apex acuminate. Fronds subdimorphic, distant; stipe stramineous, 6.5-48 cm; rachis usually winged, to 3.2 cm wide; lamina pinnate to deeply pinnatifid, oblong-ovate or ovate-lanceolate in outline, 17-70 × 8-22(-50) cm, herbaceous to papery, dark brown, glabrous, base narrowly cuneate and decurrent, margin entire to distinctly undulate-repand; lobes 3-14 pairs, linear to narrowly lanceolate or elliptic, 4.5-24 × 0.9-3.8 cm, apex long acuminate; fertile fronds usually with longer stipes, narrower pinnae or lobes, papery; lateral veins often rather crooked and ill defined, forming 2 or 3 irregularly arranged areoles, free included veinlets often forked. Sori linear, sometimes interrupted, one between each pair of lateral veins. 2n = 72.

Forests, on slopes or rocks, sometimes wet; 100-2500 m. Anhui, Chongqing, Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hunan, Jiangsu, Jiangxi, Sichuan, Taiwan, Xizang, Yunnan, Zhejiang [Bhutan, India, Japan, Korea, Myanmar, Nepal, Philippines, Thailand, Vietnam].

Colysis elliptica (Thunberg) Ching f. furcans (Tutcher) Ching (Bull. Fan Mem. Inst. Biol. 4(10): 335. 1933; Gymnogramma elliptica (Thunberg) Baker var. furcans Tutcher, J. Linn. Soc., Bot. 37: 69. 1904; Polypodium ellipticum Thunberg var. furcans (Tutcher) Ching; P. pothifolium Mettenius var. furcans (Tutcher) Ching) is based on a form of Leptochilus ellipticus with serrate basal pinnae and deeply divided distal pinnae.

1 Fronds pinnatifid to a broadly winged rachis, margin distinctly undulate-repand.   9c var. flexilobus
+ Fronds pinnate to pinnatisect to narrowly winged rachis, margin entire or sometimes indistinctly slightly undulate   (2)
2 (1) Pinnae 5-9(-14) pairs   (3)
+ Pinnae 2-5 pairs   (4)
3 (2) Plants 30-50 cm, fronds subdimorphic, papery, veins and veinlets indistinct, largest lobe 7-12 ?0.9-1.6 cm, rhizome 2.5-4.5 mm wide.   9a var. ellipticus
+ Plants 70-100 cm, fronds monomorphic, herbaceous, veins and veinlets distinct, largest lobe 13-24 ?1.7-2.8 cm, rhizome 5-10 mm wide.   9b var. pothifolius
4 (2) Lamina thinly leathery, 17-30 cm, less than 12 cm wide, largest lobe 5-8 ?1.4-2.2 cm.   9d var. longipes
+ Lamina herbaceous, 40-70 ?12-22 cm, largest lobe 11-18 ?1.7-3.7 cm.   9e var. pentaphyllus

Lower Taxa


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