过山蕨 guo shan jue

Antigramma sibirica (Ruprecht) J. Smith; Camptosorus sibiricus Ruprecht; Phyllitis sibirica (Ruprecht) Kuntze; Scolopendrium sibiricum (Ruprecht) Hooker.

Plants up to 20 cm tall. Rhizome erect; scales blackish brown, narrowly triangular, entire. Fronds caespitose, dimorphic, sterile fronds smaller with stipe 1-3 cm and lamina 1-2 × 0.5-0.8 cm, elliptic, base broadly cuneate and slightly decurrent, apex obtuse; fertile fronds larger with stipe 1-5 cm, lamina lanceolate, 10-15 × 0.5-1 cm, base cuneate (cuneate-attenuate), decurrent, margin entire or slightly sinuate, apex acuminate, flagelliform (3-8 cm) and terminating in a gemma or rooting. Veins anastomosing, obscure, with 1-3 rows of areoles, usually a row of areoles close to midrib (rachis), other veinlets free. Fronds herbaceous, dark green after drying, subglabrous. Sori in 1-3 irregular rows on both sides of midrib (rachis), linear to elliptic; indusia gray-green to brownish, linear or elliptic. Spores with lophate (cristate-alate) perispore. Plants sexual diploid: 2n = 72.

On rocks in forests; 300-2000 m. Hebei, Heilongjiang, Henan, Hubei, Jiangsu, Jilin, Liaoning, Nei Mongol, Ningxia, Shaanxi, Shandong, Shanxi, Sichuan [Japan, Korea, Russia].

Based on its peculiar morphology and venation pattern, Asplenium ruprechtii has often been put in the satellite genus Camptosorus Link, containing two species (one in Asia, the other in North America). Modern studies have shown that Camptosorus nests within Asplenium and does not form a separate clade.

Asplenium ruprechtii is diploid (Kurita, J. Jap. Bot. 40: 234-244. 1965; Mitui, J. Jap. Bot. 40: 117-124. 1965) and hybridizes with tetraploid A. anogrammoides ("A. sarelii" sensu Kurita et auct. Jap., not Hooker) to form the sterile triploid A. ×kitazawae Sa. Kurata. It is also ancestral to the following species.