Inches. -. A shoe size is a numerical indication of the fitting size of a shoe for a person. Several different shoe-size systems are still used today worldwide. In some regions, it is even customary to use different shoe-size systems for different types of shoes (e.g., men's, women's, children's, sport or safety shoes).
Types of Algae. Brown Algae (Diatoms)  This is the first type of algae that begins growing in a new aquarium. It usually grows on the gravel and glass. Unlike other types of algae, this type requires silicates in order to grow. By increasing light levels, this type of algae can be replaced by the more beneficial green algae. Brown algae can easily be scraped off the glass.
Types of Slime Algae. The slime algae growing in your backyard pond is either green algae or blue-green algae. Green alga (Spirogyra) is a filamentous alga found near the edges of lakes, ponds and ditches. This bright green, mat-forming alga produces long strands covered in a slimy coating.