Phymatosorus in Flora of China @ efloras.org

22. Phymatosorus Pichi Sermolli, Webbia. 28: 457. 1973.

瘤蕨属 liu jue shu

Plants epiphytic or terrestrial. Rhizome long creeping, fleshy, scaly; scales brown, dark brown, or nearly black, orbicular, ovate, or ovate-lanceolate, usually thin, peltate, distinctly clathrate. Fronds remote, articulate to rhizome at base. Stipe usually straw-colored, scaly at base, glabrous upward. Lamina deeply pinnatipartite or pinnate, rarely simple, lobes broadly lanceolate, herbaceous or leathery, both surfaces glabrous, margin entire, apex acuminate or obtuse; veins anastomosing to form areoles with simple or forked included veinlets. Sori orbicular or oblong, in 1 row on each side of midrib or irregularly scattered on either side of midrib, superficial or sunken on abaxial surface and raised on adaxial surface, without paraphyses. Spores yellow, ellipsoid, surface shallowly and coarsely rugose. n = 36, 37; 2n = 72, 74.

About 13 species: Old World tropics, neophytes in tropical America; six species (one endemic) in China.

1 Lamina pinnate, rachis terete except sometimes for narrowly winged apical portion; pinnae mostly with distinct stalks. 1 P. cuspidatus

+ Lamina simple or pinnatipartite to pinnatisect with bases of lateral lobes merging into broadly winged rachis (2)

2 (1) Lamina simple, ovate; stipe slender (ca. 1 mm in diam.). 2 P. lanceus

+ Lamina pinnatipartite or pinnatisect (3)

3 (2) Lamina with lateral lobes (10-)20-30(-40) pairs. 3 P. longissimus

+ Lamina with lateral lobes usually 3-10 pairs (4)

4 (3) Lamina papery, dark green; veins distinct on both surfaces. 4 P. membranifolius

+ Lamina leathery, yellowish green; veins obscure on both surfaces (5)

5 (4) Rhizome 3-5 mm in diam.; scales ovate-lanceolate with apex acuminate, margin toothed; sori in 1 row or in 2 irregular rows along each side of costa. 5 P. scolopendria

+ Rhizome 6-10 mm in diam.; scales orbicular, margin entire; sori in 1 row on each side of midrib. 6 P. hainanensis

Lower Taxa