32. Cyclosorus gustavii (Beddome) Ching, Bull. Fan Mem. Inst. Biol., Bot. 8: 215. 1938.
古斯塔毛蕨 gu si ta mao jue
Nephrodium gustavii Beddome, J. Bot. 31: 227. 1893; Christella gustavii (Beddome) Holttum.
Plants 50-100 cm tall. Rhizomes long creeping, including stipe bases with linear-lanceolate dark brown scales, similar scales on stipe bases. Fronds distant; stipes 15-25 cm, dark stramineous; laminae 40-80 × 25-35 cm, bases gradually narrowed, apices caudate with a large apical pinna; lateral pinnae 10-15 pairs, lanceolate, 12-18 × 2-3 cm, lobed ca. 1/3 toward costae, bases truncate to broadly cuneate, almost sessile, apices acuminate; apical pinnae similar to lateral ones; proximal 3-5 pairs of lateral pinnae gradually shortened, lowest pair ca. 2 cm; segments 20-30 pairs on middle pinnae, 3-4 × 3-4 mm, entire, obtuse at apices; veinlets 6-12 pairs, proximal 2 or 3 pairs anastomosing, next 1-1.5 pairs running to sinus membrane. Laminae papery, grayish green when dried, with several acicular hairs along costae and veins adaxially, with short acicular hairs along veins and minute hairs between veins abaxially. Sori orbicular, medial; indusia shortly hairy. Sporangia lacking conspicuous glands. Spores brown with long fimbriate wings.
Wet places in forests; 600-1000 m. W Yunnan [India, Thailand].
Cyclosorus gustavii has only two gatherings from W Yunnan, so our knowledge about it is quite limited. The distinction between this species and C. assamicus (Beddome) Ching, which also occurs in NE India, is not obvious. Here, we follow the treatment in Fl. Yunnan. (20: 613. 2006).