Some new, rare and interesting desmids from bromeliad phytotelmata in Brazil Author Ramos, Geraldo José Peixoto Programa de Pós-Graduação em Botânica, Universidade Estadual de Feira de Santana, Av. Transnordestina, s / nº, Novo Horizonte, 44036 - 900, Feira de Santana, BA, Brazil Author Bicudo, Carlos Eduardo De Mattos Núcleo de Ecologia, Instituto de Botânica, Av. Miguel Estéfano, nº 3687, 04301 - 902 São Paulo, SP, Brazil Author Moura, Carlos Wallace Do Nascimento Programa de Pós-Graduação em Botânica, Universidade Estadual de Feira de Santana, Av. Transnordestina, s / nº, Novo Horizonte, 44036 - 900, Feira de Santana, BA, Brazil text Phytotaxa 2018 2018-03-29 346 1 59 77 http://dx.doi.org/10.11646/phytotaxa.346.1.3 journal article 10.11646/phytotaxa.346.1.3 1179-3163 13708372 Cosmarium bahianum G.J.P.Ramos, C.E.M.Bicudo & C.W.N.Moura (2017: 67) ( Figs 9–13 ) Cell dimensions: 21–24 μm length, 18–19 μm width, 8.8–10 μm isthmus. Material examined: BRAZIL , Bahia , Santa Teresinha, Serra da Jiboia. 14-I-2015 , G . J . P . Ramos et al. s/n ( HUEFS 224661), 18-VII-2015 , G . J . P . Ramos et al. s/n ( HUEFS 224675), 11-IX-2015 , G . J . P . Ramos et al. s/n ( HUEFS 224695), 20-XI-2015 , G . J . P . Ramos et al. s/n ( HUEFS 224714) Habitat: bromeliad tanks ( Alcantarea nahoumii ); water temperature 25.8 (± 2.7 ºC). pH 5.4 (± 0.7). conductivity 0.16 (± 0.15 mS. cm-1 ). total dissolved solids 0.08 (± 0.07 ppt). dissolved oxygen 8.0 (± 3.3 mg .L- 1 ). Notes: This species was recently described from material collected in bromeliads at Parque das Dunas (Sand Dunes Park), Salvador , Bahia State , Brazil ( Ramos et al. 2017a ), and this second record occurred in very much the same type of habitat. Although the species was found to be widely distributed among bromeliads in the study area, we did not encounter zygospores, nor the subtriangular morphotype described from the material in the type locality. Nonetheless, the characteristic ellipsoid morphotype, as well as cell walls coarsely punctate, the presence of a mucilaginous sheath, cell dimensions, and the type of environment in which it was found in Serra da Jiboia, are in full agreement with the type material from Parque das Dunas in Salvador , Bahia. For now, C. bahianum was not found in other types of environments, but its frequent occurrence in bromeliads in different areas of the state suggests its preference for phytotelmata microhabitats.