雨蕨科 yu jue ke
According to molecular analysis, Gymnogrammitis is a member of the Polypodiaceae close to the Selliguea group.
雨蕨属 yu jue shu
Zhang Xian-Chun ([ch.chr.]); Hans Nooteboom
Rhizome shortly creeping. Roots restricted to ventral side; scales light brown, without pale border, not hairy but with marginal setae at least in distal part, not toothed, smooth adaxially, basifixed with cordate base and much overlapping basal lobes. Stipe articulate to phyllopodia, grooved, glabrous or with few scales; lamina compound, 3- or 4-pinnate toward base and in middle part, toward base deltoid and broadest or elongate, often narrowed, glabrous; laminae not dimorphic; pinnae linear-triangular; pinnules of at least larger pinnae anadromous; pinnules or pinna lobes linear-oblong; ultimate segments or lobes obtuse or acute without a pronounced tooth. Rachis adaxially grooved. Lamina axes glabrous. Veins in ultimate lobes simple, not reaching margin; false veins not present. Sori exindusiate, frequently single on a segment, facing midveins at bending point.
Monotypic genus: Endemic to eastern Asia.
Ching earlier (1978) pointed out that Gymnogrammitis’ resemblance to the Davalliaceae is superficial, and suggested that it belongs in the Polypodiaceae. Recent molecular phylogenic analysis has provided new insights that it is not a member of the Davalliaceae. The closest relatives are within the Selligueoid lineage of the Polypodiaceae.
雨蕨 yu jue
Polypodium dareaeforme Hooker, Sec. Cent. Ferns, t. 24. 1860; P. dareaeformioides Ching.
Rhizome short, without scales 4–5 mm in diam.; scales light brown, evenly narrowed toward apex, 2–10 mm. Stipe dark brown, 4–15 cm; lamina 3- or 4-pinnate toward base and in middle part, deltoid and broadest toward base, or elongate, often narrowing toward base, 7–37 × 7–22 cm, glabrous; longest petiolules 2–6 mm; longest pinnae 4.5–20 × 1.5–6 cm; longest pinnules or pinna lobes 15–40 × 6–25 mm; ultimate pinnules linear-oblong, lobed almost to midrib; ultimate segments 0.5–5 × 0.5–1 mm. Sori facing midveins at bending point.
Epiphytic on mossy tree trunks, epilithic in evergreen forests; 1200–2600 m. Hainan, Hunan, Guangxi, Guizhou, Yunnan [Bhutan, India, Myanmar, Nepal, Thailand].