光叶蕨 guang ye jue

Fertile fronds 40-45 cm; stipe brown at base, upward stramineous, up to 7-8 cm, base ca. 2 mm in diam., slightly swollen, with 1 or 2 lanceolate scales, upper part glabrate, grooved adaxially; rachis grooved adaxially, glabrate; lamina pale green, narrowly lanceolate, up to 35 × 6-8 cm at middle, subpapery, glabrate, gradually narrowed toward both ends, with scattered orange glands on abaxial surface; longest middle pinnae 3-4 × ca. 1 cm at base, narrowly falcate-lanceolate, base inequilateral (acroscopic side broader, truncate, basiscopic side narrowly cuneate or obtuse-rounded), pinnatipartite, lobed to 4/5 or close to costae, apex acuminate and falcate; lower pinnae gradually shorter than upper pinnae, basal pair shortest, ca. 1 cm, triangular; pinna lobes up to ca. 10 pairs, oblique, oblong, obtuse at apex, separated by narrow incisions, acroscopic basal lobe slightly longer than basiscopic one, basal 2 lobes largest, 5-8 × ca. 3 mm, upper lobes gradually shorter, basal basiscopic lobe almost broadly ovate, slightly shorter, entire at margin, or basal 1 or 2 pairs slightly crenate; costae grooved adaxially; small processes of unknown nature 1 to few, on abaxial surface of lateral veins in most middle pinna apices.

● Damp areas in forests; 2400-2500 m. W Sichuan.

Cystoathyrium chinense has not been collected recently; it is possible that it is now extinct.