Mycopteris

Smith, Alan R., Kessler, Michael, León, Blanca, Almeida, Thaís Elias, Jiménez-Pérez, Iván & Lehnert, Marcus, 2018, Prodromus of a fern flora for Bolivia. XL. Polypodiaceae, Phytotaxa 354 (1), pp. 448-450 : 448-450

Key to the Bolivian species of Mycopteris

1 Blades membranaceous, nearly transparent when dry, 0.6–1.4 cm wide; fronds indeterminate, pendent ....................... M. subtilis

– Blades papyraceous to chartaceous, opaque when dry, 1.6–8.0 cm wide; fronds determinate, pendent or erect ............................ 2

2 Rhizomes long-creeping, fronds spaced ca. 2 cm apart; blades non-setose ............................................................... M. longicaulis

– Rhizomes short-creeping to erect, fronds closely spaced; blades with at least some reddish setae either abaxially or along the pinna margins ............................................................................................................................................................................................. 3

3 Blades 1.6–2.6 cm wide, proximally with up to ca. 25 pairs of reduced pinnae; veins mostly 4–8 pairs per pinna; plants epilithic. ......................................................................................................................................................................................... M. praeceps

– Blades 2.8–8.0 cm wide, proximally truncate or with a few pairs of reduced pinnae; veins mostly 8+ pairs per pinna; plants epiphytic ........................................................................................................................................................................................... 4

4 Rhizome scales each with entire margins and a single apical seta; hydathodes adaxially without lime dots ........ M. amphidasyon

– Rhizome scales each with marginal setae and apical setae; hydathodes adaxially with lime dots .................................................. 5

5 Rachises abaxially moderately to densely setose; blades abaxially densely and evenly setose, the setae erect; marginal setae of rhizome scales hyaline .................................................................................................................................................. M. alsopteris

– Rachises abaxially glabrous or with scattered setae; blades abaxially glabrous, rarely with scattered setae; marginal setae of rhizome scales dark-colored and rigid ....................................................................................................................... M. semihirsuta