Euastrum
Desmidiaceae –
Archaeplastida

Observations on Euastrum crassum

Gallery Prof. Rupert Lenzenweger

Protisten / Home / Algae green-colored (2: Desmidiaceae): Euastrum / Euastrum crassum – Prof. R. Lenzenweger

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Euastrum crassum Ralfs 1848

Most likely ID: n.a.

Basionym: n.a.

Add’l Synonyms: Cosmarium crassum Brébisson 1840
                               Euastrum pelta Kützing ex Ralfs 1848
                               Euastrum crassum var. appendiculatum Brébisson 1856
                               Euastrum ornatum H.C.Wood 1870
                               Euastrum crassum var. scrobiculatum P.Lundell 1871
                               Helierella crassa (Brébisson) Kuntze 1891
                               Euastrum magnificum var. crassioides W.N.Hastings 1892
                               Euastrum crassum var. taturnii West & G.S.West 1905
                               Euastrum crassum f. scrobiculatum (P.Lundell) Kossinskaja 1960

Description: The cells are appr. two times longer than wide (L/W: 1.75–2) and rounded rectangular in shape. The lateral lobes are broad and rounded off flat concave. The vertex lobes are short and strongly broadened towards the flat recessed ends. They are separated form the lateral lobes only by shallow cuts. The central cuts aren’t broadened towards the periphery. At the base of the cell halves there are three swellings with a big pore at their center.

Dimension: Length (125)–140–180–(260) µm, width (65)–75–90–(115) µm.

Occurrence: Probably ubiquitous. Acidophilic alga (pH 4–6.5), common in shallow sphagnum ponds.

Left: Original graphic by Prof. Lenzenweger.
Right: Photomicrograph by Angelika-Maria Opitz (St. Ulrich am Pillersee, Austria), handed over by Prof. Lenzenweger.

© Wolfgang Bettighofer,
images under Creative Commons License V 3.0 (CC BY-NC-SA).
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Observations on Euastrum crassum

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