Prodromus of a fern flora for Bolivia. IV. Isoëtaceae Author Kessler, Michael Systematic and Evolutionary 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 text Phytotaxa 2018 2018-03-13 344 1 83 86 http://dx.doi.org/10.11646/phytotaxa.344.1.12 journal article 10.11646/phytotaxa.344.1.12 1179-3163 Isoëtes herzogii U.Weber, Hedwigia 63: 250. 1922 . Range:— Endemic to Bolivia (CO, LP, SC). Ecology:— Fairly common; submerged to nearly emergent aquatic in clear high-elevation lakes and pools in humid forest to puna environments, forming dense colonies in water to at least 6 m deep; 2600–4800 m . Notes:— Megaspores ca. 0.36 mm in diameter, usually rugulate, rarely smooth; microspores 29–34 μm long spinulose; 2 n =44.