BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Light micrograph (LM) of Euglena sanguinea, motile stage; cells emerging from mucilaginous encysted (bloom) state for dispersal. Cause of red blooms in ponds and rivers; encysted cells float on water surface; when red cartenoid pigments are at cell surface (as here), cells and bloom are red; when exposed to the sun, pigment migrates to cell center, turning cells and bloom green. Living specimens, 315X at 35mm.
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