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 Docidium baculum Brébisson ex Ralfs (1848: 158) ( Figs 49–51 ) Cell dimensions: 185–200 μm length, 9.5–10 μm width, 7–8 μm isthmus. Material examined: BRAZIL , Bahia , Santa Teresinha, Serra da Jiboia. 14-I-2015 , G . J . P . Ramos et al. s/n ( HUEFS 224657), 18-VII-2015 , G . J . P . Ramos et al. s/n ( HUEFS 224676), 11-IX-2015 , G . J . P . Ramos et al. s/n ( HUEFS 224702), 20-XI-2015 , G . J . P . Ramos et al. s/n ( HUEFS 224718). Habitat: bromeliad tanks ( Alcantarea nahoumii ); T 26.9 (± 3.2 ºC). pH 5.9 (± 0.6). C 0.23 (± 0.17 mS. cm-1 ). TDS 0.13 (± 0.11 ppt). DO 7.2 (± 2.7 mg .L- 1 ). Notes: This species is relatively easy to identify, as the base of the semicell is ornamented by a set of plications. Nonetheless, certain care was needed in the analysis of the populations from Serra da Jiboia because that species was often found in the same samples as Pleurotaenium trabecula . Although the latter species differs by having a semicell base without plications and larger cell dimensions, the populations of those taxa, when occurring together, give the false impression of morphological variation in a single species. This is the first report of the genus Docidium occurring in a phytotelmata habitat.