Euastrum quadriceps Nordstedt (1870: 216)

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 : 67

* Euastrum quadriceps Nordstedt (1870: 216) ( Figs 52–57 )

Cell dimensions: 120–135 μm length, 59–66 μm width, 10–20 μm isthmus.

Material examined: BRAZIL, Bahia, Santa Teresinha, Serra da Jiboia. 18-VII-2015, G. J. P. Ramos et al. s/n ( HUEFS 224687), 20-XI-2015, G. J. P. Ramos et al. s/n ( HUEFS 220176).

Habitat: bromeliad tanks ( Alcantarea nahoumii ); T 25.2 (± 3.2 ºC). pH 5.6 (± 0.5). C 0.29 (± 0.55 mS. cm-1). TDS 0.14 (± 0.15 ppt). DO 8.4 (± 2.9 mg.L- 1).

Notes: Euastrum . quadriceps occurred in only a few bromeliads at Serra da Jiboia, although, when found, it generally occurred in large populations. Low desmid diversity was commonly observed in those bromeliads, but among the few associated species were Cosmarium scrobiculosum , Pleurotaenium trabecula , and Micrasterias radians .

Figures

FIGURES 49–72. Docidium baculum: LM (49–50); SEM (51), ventral view (49) and the isthmus details (50–51); Euastrum quadriceps: LM (52–56); SEM (57), lateral view (52), ventral view (53, 57), apical view (54–56); Euastrum luetkemuelleri var. carniolicum: LM (58– 65) SEM (66–67), ventral view (58–60, 66), diagonal view (67), lateral view (61), apical view (62–63), zygospores (64–65); Actinotaenium mooreanum: LM (68–69, 71–72) SEM (70), ventral view (68–670) and zygospores (71–72). Scale bars 10 μm (Figs 42–59, 62–66), 5 μm (Figs 60–61). Scale bar 10 μm (49–65, 68–72), 5 μm (66–67).