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 40. Myoxanthus pulvinatus (Barb.Rodr.) Luer (1992: 72) . (Fig. 17G) Basionym: Anathallis pulvinata Barbosa Rodrigues (1882: 77) . Homotypic synonym: Pleurothallis pulvinata (Barb.Rodr.) Cogniaux (1896: 563) . TYPE :— BRAZIL . Minaes Geraes: Serra das Bicas, Barbosa Rodrigues s.n. ( holotype : lost, lectotype , here designated, tab. 144, in Iconogr. Orchid. Bresil, vol. 3, at the Library of Rio de Janeiro Botanical Garden, cited as tab. 803 [unpublished] in Barbosa Rodrigues (1882: 77); copied and reproduced in black and white in Cogniaux 1896 : tab. 91, fig. III; reproduced in colour in Sprunger et al . (1996 , vol. 1: 202). Distribution: — Brazil and Peru . Notes:— This species had been previously known only from southeastern Brazil , but this species was recently documented from Tingo María National Park, Peru (Ocupa et al. 2017). Unfortunately, no herbarium specimens were prepared. The habit and flower of M. pulvinatus is similar to M. congestus but mainly distinguished by its column apex frequently bidentate on both sides and generally apiculate lip vs . with an acute tooth on both sides and apex acute to obtuse. Since the illustration cited by Barbosa Rodrigues in the original publication of A. pulvinata is the only remaining original material associated with this species, it is designated here as lectotype .