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 Trachypteris pinnata (Hook.f.) C.Chr., Index Fil. 634. 1906. Range: —Andes from Ecuador to Bolivia ( CH , LP, SC) and northwestern Argentina . Ecology: —Fairly common; terrestrial in dry forests, mostly in open sites on steep banks or trail edges; 400–1550 m . Notes: —This cannot be confused with any other Bolivian fern. Geographically somewhat variable. Pteridaceae subfam. Parkerioideae Burnett (Parkerioid ferns) = Parkeriaceae Hook. = Acrostichaceae A.B.Frank A small subfamily of two distinct water-associated genera (this habitat otherwise unknown in Pteridaceae ), and both genera, Acrostichum and Ceratopteris , occur in Bolivia . The constituent species are either rooted in mud or floating aquatics. Spores of Ceratopteris are highly distinctive in the family, as is the unique chromosome base number, x = 39. Ceratopteris also has a rather weakly formed annulus comprising a much larger number of annulus cells, compared to other members of the family.