台灣植物誌 第二版 Flora of Taiwan, 2nd edition Vol. 1
10. GLEICHENIACEAE 裏白科
DEVOL, CHARLES E. and SHIEH, WANG-CHUENG
Terrestrial ferns forming thickets, usually growing on exposed hillsides; rhizomes long-creeping, usually growing near surface of soil, protostelic (1 exception), covered with branched hairs or fringed scales; stipes usually distant, slender, terete, wiry; c.s. of base of stipe with 1 C-shaped bundle with inrolled ends. Fronds pseudo-dichotomously branched, with a dormant apical bud between branches; apical bud covered with hairs or scales and often with stipule-like bracts; the dormant bud giving rise to an extension of the rachis at a later season, thus producing a very long rachis with side branches; ultimate branches pinnatifid or bipinnatifid, cut nearly to costa; veins free, simple or forked. Sori on back of veins, exindusiate; sporangia few per sorus (2-15), subsessile or with very short stalk; annulus complete, oblique, dehiscing vertically. Spore number large (200-800), trilete or monolete, smooth. Mature gametophyte ribbon-like with midrib.
Considered as having one to six genera depending on concept of author. One hundred and twenty species. The genus Stromatopteris (not found in Taiwan) is usually placed in this family but differs so much from the others that it is not included in the above family description.
KEY TO GENERA
1. Ultimate branches pinnatifid; rhizomes covered with multicellular hairs; veins more than once forked; sporangia usually more than 8 per sorus… 1. Dicranopteris
1. Ultimate branches bipinnatifid; rhizomes covered with lanceolate scales; veins simple or once forked; sporangia usually 2-6 per sorus… 2. Diplopterygium
1. DICRANOPTERIS Bernh. 芒萁屬
Rhizomes covered with deciduous, multicellular hairs of various types: straight, irregularly branched, stellate; ultimate branches deeply pinnatifid; dormant bud covered by stiff hairs and usually by small stipule-like lobed bracts; reflexed accessory leafy branches (similar to ultimate branches) usually borne at base of forks; veins more than once forked; branching habit of frond varies with the species (Holttum, F1. Mal. 2: 61-63. 1954). Sori without paraphyses; sporangia 8-15. Sproes monolete or trilete.
About 10 species in tropical and subtropical regions, one species with 4 varieties in Taiwan.
1. Dicranopteris linearis (Burm. F.) Under. In Bull. Torrey Bot. Club 34: 250. 1907; DeVol in Fl. Taiwan 1: 89. 1975. 芒萁
Dicranopteris dichotoma (Thunb.) Bernh. In Schrad. New. Journ. Bot. 1 (2): 38, 49. p1. 3. f. 12. 1806.
Gleichenia linearis (Burm. F.) Clarke in Trans. Linn. Soc. Bot. 1: 428. 1880; Ogata, Icon. Fil. Jap. 4: p1. 180. 1931.
There are many varieties of this species, some seem quite distinct and could be considered as species, but in most cases there is so much variation that even variety rank is questionable. There probably is a lot of hybridization.