Six labelled cultures of freshwater diatoms, to illustrate pennale and centrale morphology and unicellular & colonial organisation. Genera chosen are usually of large size and visually exceptional. Typical examples are Asterionella, Navicula, Fragilaria, Pinnularia, Tabellaria and Stephanodiscus,etc.
Prior to use it is best to keep cultures near a north facing window (no sunlight) at ambient room temperature 10-25°C.
Cultures usually remain viable for up to two weeks.