4. Lemmaphyllum diversum (Rosenstock) Tagawa, Acta Phytotax. Geobot. 14: 9. 1949.
披针骨牌蕨 pi zhen gu pai jue
Polypodium diversum Rosenstock, Hedwigia 56: 346. 1915; Lemmaphyllum adnascens Ching; L. christensenii Ching; L. intermedium (Ching) Li Wang; Lepidogrammitis adnascens (Ching) Ching; L. christensenii (Ching) Ching; L. diversa (Rosenstock) Ching; L. elongata Ching; L. intermedium Ching; L. kansuensis Ching.
Plants 3-10 cm tall. Rhizomes to 1.5 mm in diam., sparsely to densely scaly; scales brown, subulate-lanceolate, margin denticulate. Fronds remote, ± dimorphic; stipe straw-colored, 0.5-3 cm, smooth; sterile fronds not very different from fertile fronds, stipe 0.2-1.5 cm, lamina oblong or narrowly to broadly lanceolate, 3.5-10 × 0.5-2.5 cm, when dried subleathery, brown or grayish green, glabrous or abaxially sparsely scaly, base cuneate and decurrent, margin entire, slightly revolute when dried, apex rounded to bluntly acuminate. Fertile fronds: stipe 1.2-4 cm; lamina mostly similar to that of sterile frond but longer and narrower, sometimes narrowly oblong, 5-16 × 0.3-2.8 cm, apex obtuse or shortly acute; costa raised on both sides, veinlets not obvious. Sporangia in discrete sori in 1 line on each side of midrib, sori mostly orbicular, occasionally elliptic and up to 3-4 mm, sometimes some confluent when mature.
● On rocks in forests or by forest margins, thickets beside streams; 700-2200 m. Fujian, Gansu, Guangdong, Guangxi, Guizhou, Hubei, Hunan, Jiangxi, Shanxi, Sichuan, Taiwan, Yunnan, Zhejiang.
The whole plant is used in traditional Chinese medicine for inflammation, arthralgia, and bleeding due to surgery, trauma, etc.
Lemmaphyllum diversum has been variously misidentified as L. subrostratum (C. Christensen) Ching (Tagawa, Acta Phytotax. Geobot. 5: 112. 1936), Lepidogrammitis rostrata (Beddome) Ching (De Vol & Kou, Fl. Taiwan 1: 183, t. 63. 1975), and Polypodium megasorum C. Christensen (Hayata, Icon. Pl. Formosan. 8: 153. 1919). "Polypodium chingii C. Christensen" is a herbarium name that was included in the synonymy of Lemmaphyllum christensenii.