Euastrum luetkemuelleri var. carniolicum (Lütkemüller) Willi Krieger (1937: 561)

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 luetkemuelleri var. carniolicum (Lütkemüller) Willi Krieger (1937: 561) . ( Figs 58–67 )

Cell dimensions: 22–27 μm length, 12–16 μm width, 4.5–6 μm isthmus; Zygospore 19–26 μm diameter.

Material examined: BRAZIL, Bahia, Santa Teresinha, Serra da Jiboia. 14-I-2015, G. J. P. Ramos et al. s/n ( HUEFS 224662), 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 224698), 20-XI-2015, G. J. P. Ramos et al. s/n ( HUEFS 224718).

Habitat: bromeliad tanks ( Alcantarea nahoumii ); T 27.2 (± 3.2 ºC). pH 5.8 (± 0.4). C 0.24 (± 0.18 mS. cm-1). TDS 0.11 (± 0.09 ppt). DO 7.4 (± 3.2 mg.L- 1).

Notes: Euastrum luetkemuelleri var. carniolicum was previously identified in the area as Euastrum sublobatum var. sublobatum f. elongatum ( Ramos et al. 2011) . A more detailed analysis of the material (including other cell views and SEM analysis), however, allowed us to state that it is a different taxon. Euastrum sublobatum shows a median intumescence in lateral view, a characteristic absent in E. luetkemuelleri .

Some morphological variation was observed in the outline of the basal lobe, which could be retuse or slightly concave. Variation was also observed in the shape of the zygospores, ranging from ellipsoidal to spherical (the most common), always with spines.

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).