Dennstaedtiaceae

Schwartsburd, Pedro B., Navarrete, Hugo, Smith, Alan R. & Kessler, Michael, 2017, Prodromus of a fern flora for Bolivia. XXVI. Dennstaedtiaceae, Phytotaxa 332 (3), pp. 251-268 : 252

Key to the Bolivian genera of Dennstaedtiaceae

1 Indusia on the abaxial blade surface, opening toward the flat, unmodified blade margin ............................................... Microlepia

- Indusia marginal, formed by the modified, recurved margin (sometimes with a separate, generally obscure indusium on the abaxial surface); or indusia cup-or purse-shaped; or indusia lacking ........................................................................................................... 2

2 Indusia cup-or purse-shaped.......................................................................................................................................... Dennstaedtia

- Indusia formed by the modified, recurved margins (sometimes with separate, generally obscure indusia on the lower surface); or indusia lacking .................................................................................................................................................................................. 3

3 Veins wholly anastomosing into polygonal areoles; blades 1-pinnate-pinnatifid, densely long-hairy below ...................... Blotiella

- Veins free or in fertile segments forming marginal commissural veins; blades commonly 2-pinnate-pinnatifid or more divided, variously hairy or glabrous ............................................................................................................................................................... 4

4 Sori each borne on 1 vein; petioles often spiny ................................................................................................................. Hypolepis

- Sori each borne on a few to many veins; petioles not spiny ............................................................................................................ 5

5 Sterile segments with modified recurved margins similar to indusia but narrower .......................................................... Pteridium

- Sterile segments unmodified at margins ........................................................................................................................................... 6

6 Inner indusia present (small and often hidden by maturing sporangia) .................................................................................. Paesia

- Inner indusia lacking ....................................................................................................................................................... Histiopteris