台湾辐禾蕨 tai wan fu he jue

Type: China. Taiwan: Yilan, Yingtzuling, 24°55′N 121°48′E, 900 m, 12 Jan 2002, Pi-Fong Lu 2999 (holotype, TAIF! [herbarium no. 158145]).

Radiogrammitis taiwanensis has tufted marginal hairs similar to those of R. jagoriana (Mettenius ex Kuhn) Parris but shorter; R. taiwanensis never has the lateral veins prominent, while in R. jagoriana they are sometimes ± prominent on either or both sides of the lamina.

Rhizome with scales. Stipe less than 1 cm, with dense simple, mainly solitary, sometimes tufted, medium to dark reddish brown hairs, not of 2 lengths, up to 0.8 mm. Lamina linear or linear-oblong to narrowly oblanceolate, 2-9 × 0.3-0.6 cm, base long attenuate, margin entire, apex bluntly acute to obtuse; midrib visible on both surfaces, distinctly prominent abaxially, plane or slightly prominent adaxially at base; lateral veins hidden, even by transmitted light, 1-forked, acroscopic branch not extending beyond sorus, much shorter than basiscopic branch, endings without hydathodes; hairs simple, dark reddish brown or nearly so, usually solitary (rarely tufted) on both surfaces, solitary and tufted on margins, scattered to dense, usually 0.2-0.7 mm, up to 2 mm for some on abaxial surface of lamina. Sori orbicular or oval, superficial or shallowly depressed, close to midrib, extending more than halfway to margin. Sporangia setose.

● Epiphytic or on moss-covered rocks; 800-1600 m. Taiwan.

Material of this species has been misidentified as Grammitis jagoriana (Mettenius ex Kuhn) Tagawa (e.g., FRPS 6(2): 316. 2000) and G. fenicis Copeland. For more details, including keys, see Huang (Fl. Taiwan, ed. 2, 1: 526-529. 1994) and Knapp (Ferns Fern Allies Taiwan, 240, 245, 458, 747-748, 750-751. 2011).