锡金对囊蕨 xi jin dui nang jue

Lunathyrium sikkimense Ching, Acta Phytotax. Sin. 9: 72. 1964.

Rhizomes ascending. Fronds caespitose; fertile fronds ca. 35 cm; stipe upward stramineous, ca. 10 cm, ca. 1.5 mm in diam., base densely scaly, upward glabrate; lamina pinnate, narrowly oblong-lanceolate, ca. 30 × 7 cm, acuminate at apex; pinnae pinnatipartite, ca. 16 pairs, 3 or 4 lower pairs gradually shortened toward base, basal pair ca. 1.4 cm, subopposite, separated, middle pinnae alternate, ca. 1.2 cm apart, linear, ca. 4 cm × 8 mm, shortly acuminate at apex, base truncate, oblique, pinnatipartite; segments 12-14 pairs, thin, approximate, rectangular or oblong, 3-4 mm, less than 2 mm wide, entire, obtuse or subtruncate at apex. Veins visible abaxially, 4 or 5 pairs per segment, simple. Lamina papery when dried, brown, rachis stramineous, rachis and costae with more brown-red multicellular hairs abaxially. Sori small, broadly ovate or oblong, 2-4 pairs per segment; indusia similar to sori, dark brown, entire. Spores bilateral, perispore surface rugose.

Forests; 3000-4300 m. Xizang (Yadong) [India (Darjeeling)].

Deparia sikkimensis is the smallest species in the genus, with the pinnae and segments very small and thin.