Desmids –
Archaeplastida (Part)
Observations on Euastrum crassum
Gallery Prof. Rupert 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.
Copyright by Prof. Rupert Lenzenweger, Ried im Innkreis, Austria.
© Wolfgang Bettighofer,
images under Creative Commons License V 3.0 (CC BY-NC-SA).
For permission to use of (high resolution) images please contact postmaster@protisten.de.
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striolatum
teliferum
pseudopyramidatum
pyramidatum
scabrum
capitulum
forficulatum
oligacanthum
var. incisum
chlamydosporum
arcuatum
var. subavicula
truncata
var. quadrata
rubescens
venustum
var. excavatum
ralfsii
var. montanum
ralfsii
digitus
acerosum
intermedium
dissiliens
kuetzingii
ralfsii
var. hybridum
aureus
botrytis
quadratum
quadrum
crassa
digitus
var. lamellosum
digitus
var. latum
oblongum
interruptum
spec.
spec.
kinahanii
spec.
polymorphum
var. polymorphum
brebissonii
rotata
swartzii
antilopaeum
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var. notata
forficulatum
var. verrucosum
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hirsutum
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minor
borreri
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caelatum
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pulchellum
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