单行耳蕨 dan hang er jue

Cyrtomium uniseriale Ching ex K. H. Shing, Acta Phytotax. Sin., Addit. 1: 15. 1965; C. uniseriale f. marginale Ching ex K. H. Shing.

Plants evergreen. Rhizome erect, densely covered with lanceolate brown scales. Fronds 30-50 cm; stipe stramineous, 14-30 cm, 2-3 mm in diam. at base; basal stipe scales dense, brown, narrowly ovate and lanceolate, with small teeth; distal stipe scales similar but smaller, gradually sparser toward stipe apex. Lamina 1-pinnate, lanceolate, 22-42 × 5-10 cm, slightly contracted at base, acuminate; rachis scaly; scales brown, lanceolate and linear, curled. Pinnae 20-24 pairs, alternate, slightly ascendant, shortly stalked, falcate-lanceolate, lower pinnae 3.5-7 × 1-1.5 cm, bases oblique, acroscopic margins nearly truncate and with acute auricles, basiscopic margins cuneate, margins with forward-pointing small blunt teeth, apices acuminate or nearly caudate; adaxially glabrous, abaxially with lanceolate brown microscales; frond texture thinly leathery; venation pinnate, slightly raised abaxially, indistinct adaxially, veinlets anastomosing to form 1 row of areoles. Sori in 1 row on each side of midrib; indusia present, entire. 2n = 164*.

● Under shrubs, bamboo forests; 400-1100 m. Chongqing, S and W Sichuan (Pingshan, Ya’an).

Polystichum uniseriale is a sexual tetraploid.