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

1. Loxogramme lankokiensis (Rosenstock) C. Christensen, Index Filic., Suppl. 3: 125. 1934.

老街剑蕨 lao jie jian jue

Polypodium lankokiense Rosenstock, Meded. Rijks-Herb. 31: 5. 1917.

Rhizome long creeping, slender, ca. 0.5 mm in diam., densely scaly throughout; scales dark brown, thin, distinctly clathrate, lanceolate, ca. 2 × 0.5 mm, margin entire. Fronds distant, dimorphic; sterile fronds: stipe short, ca. 2 mm, fleshy, entire at margin; lamina suborbicular or obovate, 0.4-1 cm long and wide; fertile fronds: lamina oblanceolate, 1-3 × ca. 0.5 cm, widest at apex, narrowed at base, base decurrent to 2 mm from stipe base, margin of lamina narrowly involute, apex obtuse-acute; costa distinct abaxially; veins quite invisible. Sori 2 or 3 pairs on upper part of lamina, oblong, oblique, slightly sunken into lamina, paraphyses absent. Spores globose-trilete.

Epilithic on moss-covered rocks in forested valleys; 900-1400 m. Guangdong, Guizhou (Libo), SE Xizang, Yunnan [N Thailand, Vietnam].

Loxogramme lankokiensis is one of the smallest plants in the genus and has dimorphic fronds. A similar species, L. conferta Copeland, is distributed in the Philippines and Borneo but has different rhizome scales.


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