Prodromus of a fern flora for Bolivia. XXVI. Dennstaedtiaceae Schwartsburd, Pedro B. Navarrete, Hugo Smith, Alan R. Kessler, Michael Phytotaxa 2017 2017-12-22 332 3 251 268 3NWM7 M. Kessler & A. R. Sm., Brittonia M. Kessler & A. R. Sm., Brittonia [136,732,158,185] Polypodiopsida Dennstaedtiaceae Hypolepis Plantae Polypodiales 9 260 Tracheophyta species scandens   Ecology:—Uncommon; terrestrial, scandent in disturbed humid forests; 1700–2500 m.  Notes:—  Hypolepis scandensis somewhat similar to  Hypolepis parallelogrammain having spiny petioles and rachises and indument composed especially of trichomidia. It differs from  H. parallelogrammaby petioles and rachises with longer spines (0.3–3 vs. 0.2–0.6 mmlong), inequilateral proximal pinnae ( vs.equilateral), laminar tissue between the veins abaxially with trichomidia ( vs.glabrous), and pseudo-indusia proximally greenish, distally hyaline ( vs.stramineous). A somewhat similar species that may occur in Boliviais  Hypolepis stuebeliiHieron., from the Greater Antilles, Venezuela, and Colombiato Peru. It is characterized by spiny petioles and rachises, hirsute laminar axes, hirsute laminar tissue between the veins abaxially, and ciliate pseudo-indusia ( Schwartsburd & Prado 2016). The hirsute laminar axes and laminar tissue between veins distinguishes this species from  H. scandens,which has trichomidia in such parts. The name “  Hypolepis acuminataM.Kessler & A.R.Sm.” on some paratypesis unpublished. A specimen from LP (Nor Yungas, Cantón Pacollo,  Portugalet al. 350, LPB, UC) may possibly be a juvenile  Hypolepis scandens,or a hybrid between that species and another unknown species. It is also similar to  H. melanochlaenaA.R.Sm., from Mexicoand Venezuela( Mickel & Smith 2004), and to a specimen from Ecuador( Holm-Nielsen et al. 6249, K).