3. Pentarhizidium Hayata, Bot. Mag. (Tokyo). 41: 715. 1927.
东方荚果蕨属 dong fang jia guo jue shu
Rhizome robust, erect or shortly creeping, apex ascending, dark brown, apical part densely covered with brown scales; scales lanceolate or broadly lanceolate, membranous, entire. Fronds approximate or tufted. Stipe of sterile frond brown, base swollen, bearing short or prominent pneumatophores, densely scaly, upward sparsely scaly; sterile lamina bipinnatifid, ovate-deltoid or elliptic, narrowed upward, slightly narrowed downward, papery, with sparse fibriform scales on rachis; pinnae 15-25 pairs, basal pinnae as long as above or shortened, base slightly narrowed, sessile, apex acuminate; lobes narrowly hemielliptic or oblong, entire or slightly dentate, apex obtuse, acute, or truncate; veins obvious, pinnate, veinlets simple or occasionally furcate, reaching lamina margin. Fertile lamina as long as or shorter than sterile lamina, pinnate, elliptic; pinnae close, dark purple, linear. Sori fused into linear coenosori when mature, indusiate or exindusiate.
Two species: E and S Asia; two species in China.