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FOC | Family List | FOC Vol. 2-3 | Dryopteridaceae | Cyrtomium

4. Cyrtomium hemionitis Christ, Bull. Acad. Int. Géogr. Bot. 20: 138. 1910.

单叶贯众 dan ye guan zhong

Cyrtomium nephrolepioides (Christ) Copeland f. hemionitis (Christ) Ching.

Plants 4-28 cm tall. Rhizome erect, densely covered with lanceolate brown scales. Stipe stramineous, 4-18 cm, 1-3 mm in diam. at base, scaly throughout; scales dark brown, lanceolate or linear, margins entire or ciliate, often twisted. Lamina often simple, sometimes lower portion deeply pinnatifid and forming 1 pair of lobes or free pinnae, deltoid-ovate, both sides of lower portion often elevated at obtuse angle, 4-12 × 3.5-10 cm, base deeply cordate, margins entire, apex acute or acuminate; leathery, abaxially with hairlike microscales, glabrous adaxially; venation palmate, indistinct abaxially, slightly raised adaxially, veinlets anastomosing to form multiple rows of areoles on each side of midrib, each areole with 1-3 included veinlets. Sori throughout abaxial surface of lamina or pinnae; indusia with weakly dentate margins. 2n = 123*.

Limestone crevices in forests; 1100-1800 m. Guangxi, S Guizhou (Guiding, Libo), S Yunnan (Malipo, Xichou) [N Vietnam].

Cyrtomium hemionitis is an apomictic triploid.


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