Now, so far as we know, there is no natural limit to the existence of the Euglena, or of any other living germ.
Many of these minute plants develop locomotion and a degree of sensitiveness (Diatoms, Peridinea, Euglena, etc.).
Of the first group, Euglena (Fig. 9), may be selected as a type.
The principal species are the Euglena viridis and the Euglena pyrum.
In this way Engelmann was able to determine the evolution of oxygen by Euglena and by chlorophyl granules.
Among unicellular green alg, Chlamydomonas, has its maximal efficiency in the yellowish-green and Euglena in the blue.
Furthermore, the Euglena will increase in size; but this increase is by no means unlimited, as the increase of a crystal might be.
Astsia hmatdes (fig. 25), which is probably a form of the Euglena, is found in stagnant pools, which it renders red.
Euglena viridis the dabbler calls them, which seems unnecessary information.
Any of various unicellular protist organisms of the genus Euglena that live in fresh water, have a cylindrical or sausage-like shape, and move by means of a flagellum. Euglenas contain chloroplasts and can produce their own food by photosynthesis. They can also absorb nutrients directly into the cell from the environment. Euglenas have no rigid covering or cell wall, such as the cellulose cell walls of green algae or plants, over the membrane enclosing the plasma of their cells. They also have a reddish, light-sensitive eyespot which helps them navigate in relation to light sources. In warm weather, euglenas multiply rapidly and form scum on the surfaces of bodies of water.