A taxonomic synopsis and morphological characterization of Myoxanthus (Orchidaceae: Pleurothallidinae) Author Rojas-Alvarado, Gustavo 0000-0002-8918-0823 Jardín Botánico Lankester, Universidad de Costa Rica, Cartago, Apartado 302 - 7050, Costa Rica & gustavo. rojasalvarado @ uc. ac. cr; https: // orcid. org / 0000 - 0002 - 8918 - 0823 gustavo.rojasalvarado@uc.ac.cr Author Blanco, Mario A. 0000-0001-7369-5411 Jardín Botánico Lankester, Universidad de Costa Rica, Cartago, Apartado 302 - 7050, Costa Rica & Centro de Investigación en Biodiversidad y Ecología Tropical, Universidad de Costa Rica, Apdo. 11501 - 2060 San José, Costa Rica & Escuela de Biología, Universidad de Costa Rica, Apdo. 11501 - 2060 San José, Costa Rica & mario. blancocoto @ ucr. ac. cr; https: // orcid. org / 0000 - 0001 - 7369 - 5411 mario.blancocoto@ucr.ac.cr Author Karremans, Adam P. 0000-0001-5987-7710 Jardín Botánico Lankester, Universidad de Costa Rica, Cartago, Apartado 302 - 7050, Costa Rica & Naturalis Biodiversity Center, Endless Forms, Sylviusweg 72, Leiden 2333 BE, The Netherlands & akarremans @ gmail. com; https: // orcid. org / 0000 - 0001 - 5987 - 7710 akarremans@gmail.com text Phytotaxa 2021 2021-06-10 507 3 211 258 http://dx.doi.org/10.11646/phytotaxa.507.3.1 journal article 10.11646/phytotaxa.507.3.1 1179-3163 5425729 33. Myoxanthus oliviae Kolanowska & Szlachetko (2019: 3) (Fig. 15K) TYPE :— PERU . Cuzco : Urubamba , 3100 m ., 5 Dec 1968 , Vargas 20860 ( holotype : AMES !). Distribution: — Peru . Notes:— Myoxanthus oliviae , described from Peru , was said to differ from M. serripetalus in the colour of flowers, brownish yellowish vs . dark-purple, an entire midlobe vs. fimbriate midlobe and apex of the petals sagittate vs. apex oblong to linear. According to our revision, the linear apex of the petals in M. serripetalus (and dark-purple flowers) appears to be consistent. However, the entire midlobe of the lip in M. oliviae and brownish flowers are inconsistent, but a fimbriate margin may also be found.