Euastrum croasdaleae var. incrassatum Kurt Först. & F.Ecker (1964: 352)

Ramos, Geraldo José Peixoto, Costa, Fabiana De Matos, Santos, Maria Aparecida Dos & Moura, Carlos Wallace Do Nascimento, 2019, Taxonomic novelties, new records, and rare species of desmids from the Chapada Diamantina region, Brazil, Phytotaxa 391 (3), pp. 185-196 : 189

Euastrum croasdaleae var. incrassatum Kurt Först. & F.Ecker (1964: 352) ( Figs 17–20 )

Cell dimensions: length 22–25 μm, breadth 15–17 μm, isthmus 5–7 μm

Habitat characteristics: Ephemeral puddle in the mountain.

Material examined: HUEFS 244147.

Notes: This variety is distinguished by the presence of a thickening at the extremities of the lateral and apical lobes. It is a fairly rare taxon, which was also described for Bahia, although Förster (1964) did not specify in which municipality the sample was collected. In our specimens studied, we noticed that the apical incision is slightly shallower than the taxon illustrated by Förster (Tf. 3, fig. 12, pg. 443), while the other characteristics are in full agreement.

Figures

FIGURES 2–27. Cosmarium diamantinum (2–6): ventral view (2–4), lateral view (5) apical view (6); Cosmarium dimaziforme var. concavum (7–10): ventral view (7), lateral view (8) apical view (9), cell division (10); Cosmarium pentachondrum (11–13): ventral view (11), lateral view (12) apical view (13); Euastrum bahiense (14–16): ventral view (14), lateral view (15) apical view (16); Euastrum croasdaleae var. incrassatum (17–20): ventral view (17,18), lateral view (19) apical view (20); Euastrum duplicato-verrucosum (21–25): ventral view (21,22), lateral view (23) apical view (24), zygospore (25); Euastrum octogibbosum (26–27): LM (26), SEM (27). Scale bar 10 μm.