Didymochlaena, Desvaux, 1811

Shang, Hui, Liang, Zhen-Long & Zhang, Li-Bing, 2021, Taxonomy of the fern genus Didymochlaena (Didymochlaenaceae) from Asia and Pacific islands based on morphological and molecular evidence with the description of four new species and one new status, Phytotaxa 479 (1), pp. 71-82 : 74

Key to the Malesia species of Didymochlaena

1. All pinnae sessile, basalmost pinnules catadromous located at axil between rachis and pinna rachis ..............................................2

- At least lower pinnae petiolulate, basalmost pinnules subopposite or anadromous...........................................................................3

2. Fertile pinnules shorter than 1.2 cm ................................................................................................................................. D. oceanica

- Fertile pinnules larger than 1.5 cm ................................................................................................................................. D. truncatula

3. Upper pinnae also petiolulate, basalmost pinnules subopposite or anadromous......................................................... D. philippensis

- Upper pinnae always sessile, basalmost pinnules catadromous.........................................................................................................4

4 Sori nearly circular ............................................................................................................................................................ D. punctata

- Sori elliptic or ovate ...........................................................................................................................................................................5

5 Distal margins of pinnule always truncate or oblique ............................................................................................... D. solomonensis

- Distal margins of pinnule always rounded .........................................................................................................................................6

6 Scales on rachis and costa fibrillose, very sparse; sori 0–0.4 mm from pinnule margin ................................................... D. fijiensis

- Scales on rachis and costa fibrillose and lanceolate, dense; sori 0.4–0.8 mm from pinnule margin .................................. D. sinuosa