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

168. Polystichum guangxiense W. M. Chu & H. G. Zhou, Guihaia. 16: 205. 1996.

广西耳蕨 guang xi er jue

Plants evergreen. Rhizome ascending, brown, short, 1.5-2 cm in diam. including stipe bases, apically densely scaly; scales dark brown, lanceolate, membranous, with fine teeth. Fronds 17-42 cm; stipe stramineous or light greenish stramineous, 8-17 cm, 1-1.5 mm in diam.; basal stipe scales dense, spreading, shiny, dark brown, lanceolate or broadly lanceolate, 5-10 × 1-3 mm, membranous, finely toothed, long acuminate; distal stipe scales dense, smaller, appressed, dark brown, lanceolate to subulate, membranous, peltate, toothed. Lamina 1-pinnate, both surfaces light green or slightly grayish green when dry, linear-lanceolate, 12-27 × 2.5-3.6 cm, base nearly truncate and as wide as middle, apex abruptly contracted and pinnatifid-acuminate; rachis stramineous or light greenish stramineous, without proliferous bulbils, with numerous small scales abaxially; small scales appressed, brown, lanceolate or narrowly subulate, membranous, peltate, sparsely toothed. Pinnae 13-28 pairs, alternate, approximate, sometimes slightly imbricate, attached at right angles to rachis or slightly ascendant above middle of lamina, sessile or very shortly stalked, oblong, 1.7-2 cm × 6-8 mm, bases asymmetrical, margins entire or acroscopic margins shallowly repand, apices obtuse-rounded or slightly ascendant and obtusely rounded-truncate; acroscopic bases with broadly deltoid auricles, apex of auricles acute or obtuse, proximal margins of auricles truncate and parallel to rachis, basal basiscopic margins cuneate, slightly curved or nearly truncate, distal basiscopic margins curved; adaxially glabrous, abaxially with few microscales; microscales light brown, linear or filiform; frond texture thickly papery or nearly leathery; venation prominent abaxially, indistinct adaxially, pinnate, midrib obviously raised abaxially, slightly concave adaxially; lateral veins dichotomous, pinnate on auricles. Sori small, terminal on veinlets, close to pinna margin, sometimes medial; indusia present, light brown, membranous, entire or slightly repand.

● Limestone ridges, rock crevices in broad-leaved evergreen forests; 1200-1400 m. W Guangxi (Napo).


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