Chlorellales

Micractinium pusillum (Fresenius,1858). Usually found in four-celled colonies (only three of the four cells of this colony are seen here). Each cell has two to seven long, delicate setae. Each cell has one cup-shaped plastid with a pyrenoid. 18S ribosomal RNA gene studies place this genus in the Trebouxiophyceae. One of the distinguishing features of trebouxiophytes is metacentric mitosis in which centrioles are located near the metaphase plate of the chromosomes rather than at the spindle poles. Other characteristics include formation of microtubules parallel to the dividing cell wall during cytokinesis (phycoplast). The similar genus, Errerella, has only one spine per cell.Collected from a freshwater pond near Boise, Idaho. July 2005. Phase contrast.

Green algae live in a mucus ball. Phase contrast microscopy.

Portrait of the planktonic green alga Chodatella longiseta (Lemmerman,1898;Printz). This genus differs from the very similar Franceia in having long slender spinous processes limited to the poles of the ovoid cell. There is no gelatinous layer. There are two chloroplasts each with a prominent pyrenoid (seen in this image). Collected from a freshwater pond near Boise, Idaho June 2004. DIC optics.

Chodatella citriformis containing 8 autospores, sampled from shore water of Lake Kinneret in March 2006. This Chlorophyte (Chlorococcales) can be found in the plankton of the lake at most times of the year, particularly in May-June, but is never dominant.

Argusino, Castilla y Len, Espaa

Galende, Castille and Leon, Spain

Lardero, La Rioja, Spain

Scale bar indicates 25 m.Sample from the city park of Stockerau, Lower Austria. The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Standard with Olympus OM-D M5 MK2 camera.For permission to use of (high-resolution) images please contact postmaster@protisten.de.

Encinedo, Castilla y Len, Espaa

San Martin De Castaneda, Castille and Leon, Spain

Lardero, La Rioja, Spain

This green balls are often seen in sphagnum ponds. Looking through the stereomicroscope this group of specimen looked photogenic. The picture was generated from 5 shots using MicroPicS by Bernhard Wiedemann and Photoshop (depth of focus). Sample from sphagnum pond Dosenmoor near Neumuenster (Schleswig-Holstein, Germany). This image was taken using Zeiss Universal with Olympus C7070 CCD camera.For permission to use of (high-resolution) images please contact postmaster@protisten.de.

Dictyosphaerium spec. in mucilaginous envelope. Scale bar indicates 10 m.The specimen was gathered in the wetlands of Nationalpark Unteres Odertal ( 100 km north east of Berlin). The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.For permission to use of (high-resolution) images please contact postmaster@protisten.de.

Muelas del Pan, Castille and Leon, Spain

Caada del Hoyo, Castilla-La Mancha, Espaa

Melgar de Tera, Castille and Leon, Spain

Ribadelago de Franco, Castilla y Len, Espaa

Portrait of the planktonic trebouxiophyte alga, Tetrastrum staurogeniaeforme (Schröder) Lemmermann.The colonies consist of four ellipsoid cells with four to six short spinous projections from the each cell surface. several four-celled colonies may join together to form compound colonie (compound coenobia). Each cell has one plastid and one pyrenoid.Collected from a freshwater pond near Boise,Idaho. July 2005.DIC.

These green balls are often seen in sphagnum ponds. Looking through the stereomicroscope this group of specimen looked photogenic. The picture was generated from 5 shots using MicroPicS by Bernhard Wiedemann and Photoshop (depth of focus). Sample from sphagnum pond Dosenmoor near Neumuenster (Schleswig-Holstein, Germany). This image was taken using Zeiss Universal with Olympus C7070 CCD camera.

Argusino, Castilla y Len, Espaa

Ribadelago, Castille and Leon, Spain

Galende, Castile and Len, Spain

OLYMPUS DIGITAL CAMERA For permission to use of (high-resolution) images please contact postmaster@protisten.de.

Dictyosphaerium spec. in mucilaginous envelope. Scale bar indicates 25 m.The specimen was gathered in the wetlands of Nationalpark Unteres Odertal ( 100 km north east of Berlin). The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.For permission to use of (high-resolution) images please contact postmaster@protisten.de.