Asplenium serratum complex, 1753

Reis, Atiles, Lino, Vanessa, Mynssen, Claudine Massi & Sylvestre, Lana Da Silva, 2022, Asplenium coronatum (Aspleniaceae), a new fern species from the Brazilian Atlantic Forest, Phytotaxa 574 (2), pp. 185-190 : 189

Key to Asplenium serratum complex from Atlantic Forest

1. Veins spreading at 35°–45° from the midrib ...................................................................................................... Asplenium angustum

- Veins spreading at 60°–75° from the midrib ......................................................................................................................................2

2. Lamina margins dentate; stem scales 3.4–4.6 mm long, dark brownish ...................................................... Asplenium stuebelianum

- Lamina margins entire, crenulate or serrate; stem scales over 7 mm long, light brownish to red .....................................................3

3. Lamina margins regularly serrate or crenate; proliferous apex absent; external cells of the stem scales with thickened walls.......... ............................................................................................................................................................................. Asplenium serratum

- Lamina margins irregular, entire to slightly crenate; proliferous apex present; cells of the stem scales with walls regularly thickened............................................................................................................................................................ Asplenium coronatum