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 Actinotaenium mooreanum (W.Archer) Teiling (1954: 408) ( Figs 68–72 ) Cells solitary, approximately 2 times longer than wide, widely elliptic, apices widely rounded; chloroplast stellate, two pyrenoids; zygospore subrectangular, dark brown, with rounded-acuminate papillae. Cells 16–20 μm long, 8–9 μm wide; zygospore 17–22 μm long, 11–14 μm wide. 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 224679), 11-IX-2015 , G . J . P . Ramos et al. s/n ( HUEFS 224705), 20-XI-2015 , G . J . P . Ramos et al. s/n ( HUEFS 224721). Habitat: bromeliad tanks ( Alcantarea nahoumii ); T 26.1 (± 3.9 ºC). pH 5.9 (± 0.6). C 0.24 (± 0.18 mS. cm-1 ). TDS 0.11 (± 0.09 ppt). DO 6.4 (± 0.8 mg .L- 1 ). Notes: Actinotaenium mooreanum is reported here for the first time for South America; with previous records only from Europe and Oceania ( Guiry & Guiry 2017 ). During our analysis, we commonly found zygospores of this species—usually in groups associated with the mucilaginous sheaths of cyanobacteria. According to Růžička (1981), this species prefers slightly acidic to neutral environments (pH 4.9–7.5), similar to conditions found in bromeliad tanks.