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

7. Loxogramme avenia (Blume) C. Presl, Tent. Pterid. 215. 1836.

剑蕨 jian jue

Grammitis avenia Blume, Enum. Pl. Javae 2: 117. 1828.

Rhizome shortly creeping, more than 3 mm in diam., densely scaly near apex and at base of stipes; scales dark brown, lanceolate, 5-10 × 0.5-1.2 mm, margin entire. Fronds in tufts, monomorphic; stipes indistinct, dark castaneous when dry; lamina abaxially paler, adaxially green, lanceolate, 15-25 × 1-2.5 cm or more, broadest at middle to upper portion, narrowed below, thick and leathery, fleshy, abaxial surface with sparse brown, 2-celled glandular hairs, adaxially glabrous, base decurrent to 2-5 mm from base of stipe, margin recurved, apex acuminate; costa distinctly raised abaxially, hardly raised adaxially, pale green to brown; veins hardly visible on both surfaces, forming copious anastomoses. Sori 8-20 pairs, linear, 1-2 cm, 3-4 mm apart, oblique, continuous in middle between costa and margin of frond, slightly sunken into lamina; paraphyses many, dense, longer than sporangia, completely covering sori initially. Spores ellipsoid-monolete.

Epilithic on moss-covered rocks or epiphytic on tree trunks in dense evergreen forests beside streams at low elevations. Yunnan (Tengchong) [Indonesia (Java), Malaysia, Myanmar, Thailand, Vietnam].

Loxogramme avenia is very similar to L. involuta and L. cuspidata, but it differs from the former by the smaller, dark brown scales and from the latter by the abundant paraphyses.


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