Desmidium grevillei (Kütz. ex Ralfs) De Bary

Desmidium grevillei (Kütz. ex Ralfs) De Bary

( Fig. 3B View FIG )

Untersuchungen über die Familie der Conjugaten (Zygnemeen und Desmidieen) Ein Beitrag zur physiologischen und beschreibenden Botanik: 76 ( De Bary 1858). — Didymoprium grevillei Kützing ex Ralfs , The British Desmidieae: 57 ( Ralfs 1848).

DISTRIBUTION. — Cosmopolitan. Amazon Basin: Feitosa et al. (2015). As D. grevillii : Scott et al. (1965); Förster (1969); Thomasson (1971); Melo et al. (2005); Melo & Souza de (2009); Cadima (2013); Cunha de et al. (2013). Western Amazonia (lowlands): Araujo (2003).

DESCRIPTION

Cells 22.6-26.1 µm long, 41.1-51.0 µm wide, isthmus 37.1-47.0 µm; cells 1.8-1.9 times wider than long. Pseudofilaments not twisted, cells slightly constricted, apices flat, so there is no cavity between adjacent cells; hyaline cell wall. Median constriction shallow, with a linear or slightly open sinus. Semicells very short, from quadrangular to pyramid truncate outline, lateral margins slightly wavy.Axial chloroplast.

REMARKS

Our specimens are similar in size range and shape as those reported from Brazil ( Aquino et al. 2018) and the British Islands ( Brook & Johnson 2002). Similar taxa in shape and size include Desmidium cylindricum Greville ex Nordstedt , but this species has spiral pseudofilaments ( Burliga et al. 2016) while those of D. grevillei were not twisted.