华南条蕨 hua nan tiao jue

Oleandra cantonensis Ching; O. chinensis Hance; O. guangxiensis S. L. Mo & Y. C. Zhong; O. intermedia Ching; O. yunnanensis Ching.

Plants terrestrial or epilithic; rhizome creeping, monopodial, 3-4 mm in diam., sometimes white waxy; roots restricted to ventral side, mostly with short unbranched glabrous part ("rhizophore"); scales appressed, dark brown in basal part, lighter toward apex, narrowly triangular, 4-7 × ca. 1 mm, margin ciliate. Fronds erect, scattered or in tufts; stipe and phyllopodia together 2.5-7 cm, stramineous, phyllopodia 2-6 cm; lamina greenish brown when dry, lanceolate, to 34 × 2-3.5 cm, herbaceous, both surfaces and margin glabrous to densely long hairy, abaxially more often pubescent, more densely so on costa and veins, hairs to 2 mm, lamina attenuate to both ends, base cuneate, margin not undulate, apex shortly acuminate; costa slightly raised on both sides, narrowly grooved adaxially; veins simple or forked at base, rarely forked at middle. Sori very close to costa or up to 6 mm distant, in an irregular single line; indusia dark brown, reniform or orbicular-reniform, glabrous or hairy.

Rocky cliffs. Guangdong, Hainan, Yunnan [Indonesia, Laos, Malaysia, Philippines, Thailand].

Plants of Oleandra cumingii from Hainan differ in a number of characters: the lamina is wider, to 4.5 cm, less gradually narrowed at base, and the plants are more consistently glabrous than typical plants.