Prodromus of a fern flora for Bolivia. XXXV. Dryopteridaceae Author Kessler, Michael Systematic and Evolutionary Botany, University of Zurich, Zollikerstrasse 107, CH- 8008 Zurich, Switzerland Author Moran, Robbin C. New York Botanical Garden, 2900 Southern Blvd., Bronx, New York, 10458 - 5126, USA Author Mickel, John T. New York Botanical Garden, 2900 Southern Blvd., Bronx, New York, 10458 - 5126, USA Author Matos, Fernando B. Universidade Federal do Paraná, Departamento de Botânica, Caixa Postal 19031, 81531 - 980, Curitiba, PR, Brasil Author Smith, Alan R. Systematic and Evolutionary Botany, University of Zurich, Zollikerstrasse 107, CH- 8008 Zurich, Switzerland & University Herbarium, 1001 Valley Life Sciences Bldg. # 2465, University of California, Berkeley, CA 94720 - 2465, USA & Systematic and Evolutionary Botany, University of Zurich, Zollikerstrasse 107, CH- 8008 Zurich, Switzerland text Phytotaxa 2018 2018-06-11 353 1 448 450 http://dx.doi.org/10.11646/phytotaxa.353.1.1 journal article 10.11646/phytotaxa.353.1.1 1179-3163 Megalastrum marginatum M.Kessler & A.R.Sm., Amer. Fern J. 96(1): 40, f. 2 D–F. 2006. Range: —Endemic to Bolivia (CO, LP). Ecology: —Locally common; terrestrial in humid forests and along streams; 400–1900 m . Notes: —Differs from co-occurring and closely related M. rupicola by basally 3-pinnate blades ( vs . 2-pinnate-pinnatifid), long straight hairs ( 0.5–1.7 mm ) on costae, costules, and veins on both sides of the blades. The two species are similar in laminar cutting and have similar rachis and costal scales (i.e., lanceolate and shiny brown). Eberhardt 402 (UC), determined as an atypical member of this species by Moran et al . (2014a) , seems more likely to us to be a hybrid; it has shorter and sparser hairs than M. marginatum , unusually densely scaly costae and costules abaxially, and seemingly malformed sporangia and spores. Megalastrum longipilosum A.Rojas , from Costa Rica and Panama , was cited from Bolivia by Moran & Prado (2010) ; this specimen was later redetermined as M. marginatum ( Moran et al . 2014a ) .