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 dawsonii Lellinger & J.Prado, Amer. Fern J. 91(1): 6(–8), fig. 3. 2001. Range: — Bolivia (SC) and central Brazil . Ecology: —Rare (1 collection known), terrestrial on slopes and stream banks; 900 m . Notes: —Species of this group, including also A. cinnamomeum Lellinger & J.Prado and A. gracile Fée , both from Brazil , were treated by Lellinger & Prado (2001) ; these species are a small subset of the much larger A. tetraphyllum clade-2-pinnate species with copiously scaly rachises, numerous (per pinna) relatively small, short pinnules, and short-creeping rhizomes. Pinnules are relatively small, ca. 2 times longer than wide, with 35–55 pairs per pinna, yellow rounded glands present abaxially.