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Dictyosphaerium spec. in mucilaginous envelope. Scale bar indicates 25 µm. 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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Portrait of Dictyosphaerium pulchellum (Nägeli,1849), a colonial green alga. The small cells are ovoid to reniform and are borne at the ends of colorless branching threads in groups of four. The threads are remnants of parental cell walls. Each cell has a cup-shaped chloroplast and solitary pyrenoid.The entire colony is embedded in a nearly invisible spherical gelatinous matrix. Collected from a freshwater pond near Boise, Idaho June 2004. DIC optics.
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Botryococcus braunii (Chlorophyta, Chlorococcales) is a colonial chlorophyte, made of ovoid cells that are closely packed to form golden brown mucilaginous lumps. Older cells usually have large amounts of reserve food material (oil) such that the cell contents are obscured, and the colonies float. The species is abundant at times, forming surface scums at lee shores. On a single occasion in January 2000 a bloom of this species covered the entire lake for several days, giving it a golden color, then disappeared abruptly. This photo shows Botryococcus braunii colonies at x200 mag, with their typical mucilaginous strands connecting colonies and enveloping them.
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Portrait of Dictyosphaerium pulchellum (Nägeli,1849), a colonial green alga. The small cells are ovoid to reniform and are borne at the ends of colorless branching threads in groups of four. The threads are remnants of parental cell walls. Each cell has a cup-shaped chloroplast and solitary pyrenoid.The entire colony is embedded in a nearly invisible spherical gelatinous matrix. Collected from a freshwater pond near Boise, Idaho June 2004. DIC optics.
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A young colony of Botryococcus braunii (Chlorophyta, chlorococcales) budding out of an old colony, photographed at x1000 mag. Note cup-shape of the mucilage in which each cell is embedded.
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Dictyosphaerium pulchellum is a common chlorophyte of Lake Kinneret, relatively more abundant in winter, but never dominant. This specimen was sampled at the shore of the lake in March 2006.
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Botryococcus braunii (Chlorophyta, Chlorococcales) is a colonial chlorophyte, made of ovoid cells that are closely packed to form golden brown mucilagenous lumps. Older cells usually have large amounts of reserve food material (oil) such that the cell contents are aboscured, and the colonies float. The species is abundant at times, forming surface scums at lee shores. On a single occassion in January 2000 a bloom of this species covered the entire lake for several days, giving it a golden color, then disappeared abruptly. This photo shows Botryococcus braunii colonies at x200 mag, with their typical mucilagenous strands connecting colonies and enveloping them.
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Dictyosphaerium pulchellum is a common chlorophyte (Chlorococcales) of Lake Kinneret, relatively more abundant in winter, never abundant or dominant. Note that the sphaerical cells are in clusters of 4, attached by parental cell wall fragments radiating from a common center. The chloroplasts are parietal and cup shaped with a single pyrenoid. This specimen was sampled at the shore of the lake in March 2006.
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Colorful colonies of Botryococcus braunii (Chlorophyta, Chlorococcales) photographed at dark-field