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Euastrum verrucosum EHRENB. var. groenlandicum (LARSEN) WILLI KRIEG So far only two quite inaccurate illustrations of this alga exist: The original illustration of LARSEN (1904) and an illustration of GROENBLAD (1952). The cell halves are rounded off trapezoidal, both the lateral lobes and the vertex lobe drawn weakly into the center turn into one another, separated only by a shallow emargination. At the ends of the lateral lobes there are several short pricks. The central cuts are far opened. The hump near the isthmus range of the cell halves are covered with large warts, the remaining cell wall with concentric rows of small warts. Length 100 - 105 µm, width 80 - 85 µm. Occurrence: So far only known from Greenland
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Canencia, Madrid, Spain
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Ribadelago de Franco, Castilla y Len, Espaa
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Ribadelago de Franco, Castille and Leon, Spain
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Lumbreras, La Rioja, Espaa
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A Veiga, Galicia, Spain
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Euastrum crassum (BREB.) KÃTZ. The cells are almost two times longer than wide 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 arenât broadened towards the periphery. At the base of the cell halves there are three swellings with a big pore at their center. Dimension: Length 150 â 200 µm, width 75 â 90 µm Ecology: Acidophilic alga (pH 4 â 6.5), common in shallow sphagnum ponds. Occurrence: Probably ubiquitous
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Amer, La Rioja, Spain
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Ribadelago, Castille and Leon, Spain
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Los Cotos, Madrid, Spain
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Lumbreras, La Rioja, Spain
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Euastrum crassum (BREB.) KÃTZ. The cells are almost two times longer than wide 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 arenât broadened towards the periphery. At the base of the cell halves there are three swellings with a big pore at their center. Dimension: Length 150 â 200 µm, width 75 â 90 µm Ecology: Acidophilic alga (pH 4 â 6.5), common in shallow sphagnum ponds. Occurrence: Probably ubiquitous
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Villoslada de Cameros, La Rioja, Spain
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Galende, Castile and Len, Spain
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Galende, Castille and Leon, Spain
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Villoslada de Cameros, La Rioja, Spain
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Median optical section through Euastrum crassum using high resolution optics (Planapochromate 40/1.0) and DIC. Sample from sphagnum pond situated in the northern alpine region of Austria near Salzburg. Images were taken using Zeiss Universal with Olympus C7070 CCD camera
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The picture shows the cell wall structure with pores. It is developed using 30 high resolution frames combined with manual stacking technique. Sample from sphagnum pond situated in the northern alpine region of Austria near Salzburg. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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San Martin De Castaneda, Castille and Leon, Spain
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Galende, Castille and Leon, Spain
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Hoyo de Manzanares, Madrid, Spain
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Lumbreras, La Rioja, Spain
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Euastrum germanicum (SCHMIDLE) WILLI KRIEG. he cells are only a little longer then wide. The cell halves constist of five broadly rounded lobes. The vertex lobes which are outward somewhat widened are separated from the lobes by extended, inside rounded recessings. Each center of the cell halves showes a hemispheric bump. The cellwall is covered with parallel rows of spines. The central cuts are slender and broadly opened towards the periphery. Dimension: Length 50 â 60 µm, width 40 â 50 µm Ecology: Especially in medium acidic to weakly alcaline waters of ponds and alluvial areas (Danube meadows) Occurrence: Mainly in Europe, but probably ubiquitous
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Canencia, Comunidad de Madrid, Espaa