Trebouxiophyceae

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.

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.

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

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.

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.

Mushroom Observer Image 411241: Trebouxia jamesii (Hildreth & Ahmadjian) Gärtner

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 Martn de Castaeda, Castilla y Len, Espaa

San Martin De Castaneda, Castille and Leon, Spain

Lardero, La Rioja, Spain

Santa Cruz de la Sierra, Extremadura, 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.

Ribadelago de Franco, Castille and Leon, Spain

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

Miranda do Douro Municipality, Braganca, Portugal

Melgar de Tera, Castille and Leon, Spain

Ribadelago de Franco, Castilla y Len, Espaa

Longitude (deg): -1.1. Latitude (deg): 51.4. Longitude (deg/min): 1° 10' W. Latitude (deg/min): 51° 30' N. Vice county name: Berks. Vice county no.: 22. Country: England. Identified by: Malcolm Storey. Comment: in sample from pond surface. Category: microscope photograph. Photographic equipment used: Pixera Pro tethered low-resolution digital camera with Meiji microscope using CS adaptor and x.7 projection eye-piece.