城户氏凤尾蕨 cheng hu shi feng wei jue

Plants small, evergreen. Rhizome ascending, short; scales small, dark brown. Fronds dimorphic. Sterile fronds: stipe straw-colored, brown at base, 2.5-8 cm, with linear dark brownish scales; lamina digitate to imparipinnate; lateral pinnae (0 or)1 or 2(or 3) pairs, (4-)7-17 × 0.1-1.4 cm, margin dentate; terminal pinna 7-20 × 0.7-1.4 cm; false veinlets distinct and rather dense. Fertile fronds taller; stipe 8-22 cm; lamina 7-20 cm; lateral pinnae 1-3 pairs; lowest pinnae often forked, to 15 × 0.4-0.7 cm; terminal pinna linear, up to 22 × 0.2-0.5 cm; lamina with many false veins in mesophyll between true veins. 2n = 58.

Crevices in limestone rock faces; 300-900 m. Taiwan, ?Zhejiang [Japan].