Bolbitis yunnanensis Ching.

Rhizome shortly creeping, 5-9 cm, 1-1.5 cm in diam., densely scaly; scales dark brown, lanceolate, ca. 3 mm, margin entire. Fronds close together, 4-7 mm apart; sterile fronds pinnate; stipe 20-40 cm, near base ca. 3.5 mm in diam., densely scaly, glabrous upward; lamina grayish brown when dry, ovate, 25-35 × 20-25 cm, hard papery, both surfaces glabrous; pinnae 3-5 pairs, alternate, elliptic-lanceolate, 16-25 × 4.5-6 cm, base narrowly cuneate, margin wrinkled-undulate, apex caudate-acuminate, lower 2 pairs of pinnae with stalk ca. 1 cm; terminal segment ± similar to central pinnae; rachis not winged; secondary veins tenuous, prominent abaxially; veins inconspicuous, forming a costal large areole and 3 rows of small areoles, sometimes with included free short veinlets. Fertile fronds 35-75 cm; stipe 30-55 cm; lamina narrowly ovate, 12-25 × 10-14 cm; pinnae 2-5 pairs, lanceolate, 6-10 × 1-1.5 cm, base narrowly cuneate, apex acuminate. Sporangia inserted usually throughout abaxial surface, arrangement acrostichoid.

● Dense forests; 700-1100 m. Hainan, Yunnan.