Prodromus of a fern flora for Bolivia. XXVII. Pteridaceae Author Kessler, Michael Systematic Botany, University of Zurich, Zollikerstrasse 107, CH- 8008 Zurich, Switzerland Author Smith, Alan R. University Herbarium, 1001 Valley Life Sciences Bldg. # 2465, University of California, Berkeley, CA 94720 - 2465 Author Prado, Jefferson Instituto de Botânica, Av. Miguel Estéfano, 3687, CEP 04301 - 902, São Paulo, SP, Brasil text Phytotaxa 2017 2017-12-22 332 3 201 250 http://dx.doi.org/10.11646/phytotaxa.332.3.1 journal article 10.11646/phytotaxa.332.3.1 1179-3163 Adiantum humile Kunze, Linnaea 9: 80. 1834 . Range: — Panama ; Colombia to Guianas and Bolivia (BE, CO, LP, PA); Brazil . Ecology: —Uncommon, terrestrial in lowland wet forests; 150–850 m . Notes: —Closely related to A. terminatum ; slightly more distant relatives are A. latifolium (with which A. humile has sometimes been combined; Tryon & Stolze 1989 ) and the 1-pinnate A. petiolatum . Rachises are sparsely hairy and blades have only 2–4 pairs of lateral pinnae. The pinnules are adaxially glabrous, abaxially glaucous and with long, septate, brown hairs; margins of sterile pinnules are finely serrate; indusia glabrous.