"Ward's Science"

Characterized by a lack of rigid cellulosic walls, instead these organisms have pellicles made of protein. They store paramylon instead of starch.

Freshwater. Unicellular; homothallic strain. Basic culture solution. Characterized by green plastids and cell walls composed of cellulose.

Freshwater. Unicellular; pennate, with bilateral symmetry. Basic culture solution.

Characterized by shells (tests) made of silica, in two parts.

Marine. Unicellular. Erdschreiber’s medium.

Characterized by reddish plastids (rhodoplasts).