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 nanum R.C.Moran, J.Prado & Sundue, Amer. Fern J. 104(3): 173, figs. 2E, 8A, 32B. Range: — Ecuador , Peru , and Bolivia (SC, TA). Ecology: —Known from only five collections from the three Andean countries; terrestrial in evergreen forests; 1700–2100 m . Notes: —This is one of the smaller, decompound species in the genus, with leaves to 1 m long, and less than 75 cm long in the four specimens seen; blades are < 50 cm long. The costal scales are darkened at the tips and prominantly toothed along the margins, along with numerous long septate hairs to 2 mm on the costae, costules, and veins abaxially; this is much the same as the indument in M. fugaceum . One wonders whether M. nanum might not be a precociously fertile version of M. fugaceum ? All four collections seen of M. nanum were first determined as M. pulverulentum , another very close relative (see under M. ciliatum and M. fugaceum for further comments).