Plants medium-sized or large, usually in forests near or beside streams. Rhizomes decumbent to erect, thick. Lamina 1-pinnate, imparipinnate, with pinnae entire, glabrous; veins free on either side of midrib, fully anastomosing toward margins and forming 2-4 rows of areoles, without included free veinlets. Sori elongate along long veins close to midrib, covered by a similarly elongate, membranous indusium; indusia usually 3-8 mm, sometimes up to 1-2 cm, arched, sausage-shaped. Spores with winglike fimbriate and echinate folds, or low perforate plain folds. x = 41, 40 or 31.
Three genera and five species: tropical America, tropical, subtropical, and temperate Asia; one genus and three species in China.
Based on molecular evidence (R. Sano et al., Molec. Phylogen. Evol. 15: 403-413. 2000; Wei et al., Acta Bot. Yunnan., suppl. 17: 46-54. 2010), the family Diplaziopsidaceae consisting of Diplaziopsis and Homalosorus Small ex Pichi Sermolli (and provisionally Hemidictyum C. Presl) was proposed by X. C. Zhang and Christenhusz (Phytotaxa 19: 15. 2011).
Chu Wei-ming & He Zhao-rong. 1999. Diplaziopsis. In: Chu Wei-ming, ed., Fl. Reipubl. Popularis Sin. 3(2): 499-504.