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 pseudoconnatum Nordstedt (1870: 214) ( Figs 44–48 ) Cell dimensions: 44–48 μm length, 33–35μm width, 31–33 μm isthmus. Material examined: BRAZIL , Bahia , Santa Teresinha, Serra da Jiboia. 14-I-2015 , G . J . P . Ramos et al. s/n ( HUEFS 224658), 18-VII-2015 , G . J . P . Ramos et al. s/n ( HUEFS 224682), 11-IX-2015 , G . J . P . Ramos et al. s/n ( HUEFS 2246703), 20-XI-2015 , G . J . P . Ramos et al. s/n ( HUEFS 224720). Habitat: bromeliad tanks ( Alcantarea nahoumii ); T 28.1 (± 2.0 ºC). pH 6.2 (± 0.4). C 0.30 (± 0.15 mS. cm-1 ). TDS 0.17 (± 0.12 ppt). DO 7.4 (± 3.5 mg .L- 1 ). Notes: During our analysis, we noted variations in the chloroplasts of this species, from 4-radial (most common) to 5-radial. Morphologically, C. pseudoconnatum can be easily confused with Cosmarium connatum Brébisson ex Ralfs. The most important difference is the shape of the chloroplast in apical view: 2-radial in C. connatum , at least 4-radial in C. pseudoconnatum .