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 serratodentatum Humb. & Bonpl. ex Willd., Sp. Pl. , ed. 4 [Willdenow], 5(1): 445. 1810. Range: —Mesoamerica; Colombia to Trinidad , Guianas, and Bolivia (BE, LP, SC); Argentina , Paraguay , and Brazil . Ecology: —Common, terrestrial in open vegetation (savannas), semideciduous forests, on sandy soils; 150–750(– 1450) m. Notes: —A distinctive species of savannas, and within the large group of Adiantum tetraphyllum , A. argutum , A . latifolium , and A. obliquum , with generally more ascending pinnae and more coriaceous, entire pinnules than allies. Rhizomes very long-creeping and cord-like; rachises with two kinds of scales: lanceolate with pectinate bases and arachnoid; blades 2-pinnate, with 2–6 pairs of lateral pinnae; pinnules 2–3 times longer than wide, 10–15(–25) pairs per pinna, abaxially with lanceolate scales, adaxially glabrous, indusia bearing hairs less than 1 mm .