Cosmarium bahianum G.J.P.Ramos, C.E.M.Bicudo & C.W.N.Moura (2017: 67)

Ramos, Geraldo José Peixoto, Bicudo, Carlos Eduardo De Mattos & Moura, Carlos Wallace Do Nascimento, 2018, Some new, rare and interesting desmids from bromeliad phytotelmata in Brazil, Phytotaxa 346 (1), pp. 59-77 : 61

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.

Figures

FIGURES 1–25. Closterium cornu var. minus LM (1, 2); Cosmarium amoenum var. jiboensis: LM (3–6); SEM (7–8), ventral view (3–4, 7), lateral view (44) apical view (46–48) and detail of cell wall with granules surrounded by pores; C. bahianum: LM (9–12); SEM (13), ventral view (9–10, 13), lateral view (11) apical view (12); C. elegantissimum: LM (14–16); SEM (19), ventral view (14–15, 17–19), apical view (16); C. scrobiculosum: LM (20–23); SEM (24–25), ventral view (20–21, 25), lateral view (22) apical view (23–24). Scale bar 10 μm (1–7, 9–24), 5 μm (8, 25).