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 tetraphyllum Humb. & Bonpl. ex Willd., Sp. pl., ed. 4 [Willdenow], 5(1): 441. 1810. Range: — Mexico to Panama ; Antilles; Colombia to Trinidad and Bolivia (BE, CO, LP, PA, SC); Paraguay , Argentina , and Brazil . Ecology: —Very common, terrestrial in lowland evergreen and semideciduous forests; 100–1200(–1600) m. Notes: —A widespread, highly variable species, most easily confused with, and similar to, A. diogoanum , differing especially by the pinnule apices acute and curved toward pinna apices. Rhizomes moderately long-creeping; rachises with two kinds of scales: most scales filiform (hairlike) adaxially, others lanceolate with pectinate bases abaxially; blades with 3–6(–7) pairs of lateral pinnae; pinnules ca. 3–4 times longer than wide, 16–30 pairs per pinna, reduced toward pinna bases and apices, margins of sterile pinnules serrate to biserrate, pinnules abaxially with few scales on veins, indusia oblong, with reddish brown hairs.