Hymenasplenium

Kessler, Michael & Smith, Alan R., 2018, Prodromus of a fern flora for Bolivia. XXIX. Aspleniaceae, Phytotaxa 344 (3), pp. 259-280 : 259-280

Key to the Bolivian species of Hymenasplenium

1 Terminal pinnae roughly similar in size and shape to lateral ones; rhizomes greenish when living (sometimes turning blackish when dry) .......................................................................................................................................................................................... 2

– Blade apices pinnatifid; rhizomes brown or blackish when living ................................................................................................... 3

2 Plants usually epiphytic; petioles ¼–½ as long as the blade .................................................................................... H. repandulum

– Plants usually on rocks; petioles ca. ½ as long as the blade ........................................................................................ H. triquetrum

3 Pinnae pinnatifid throughout their length, usually lobed ¼–½ to the costae ......................................................... H. basiscopicum

– Pinnae entire to serrate ..................................................................................................................................................................... 4

4 Pinnae 7–11 × 1.2–2 cm, 6–9 pairs per blade; petioles and rachises stramineous to greenish brown ........................ H. delitescens

– Pinnae 2–6 × 0.6–1.2 cm, 10–25 pairs per blade; petioles and rachises atropurpureous .................................................. H. laetum