346. Family Œdogoniaceæ, represented by Œdogonium ([Chapter 16]).
347. Family Coleochætaceæ, represented by Coleochæte ([Chapter 17]).
348. Subclass SIPHONEÆ.—There are several families.
349. Family Botrydiaceæ.—This is represented by Botrydium granulatum (Chapter 15, [p. 146]).
350. Family Vaucheriaceæ, represented by Vaucheria ([Chapter 15]), with quite a large number of species, is widely distributed.
Class Schizophyceæ (= Cyanophyceæ).
Fig. 168.
Glœocapsa.
351. The Blue-Green Algæ, or Cyanophyceæ form slimy looking thin mats on damp wood or the ground, or floating mats or scum on the water. The color is usually bluish green, but in some species it is purple, red or brown. All have chlorophyll, but it is not in distinct chloroplasts and is more or less completely guised by the presence of other pigments. Two orders and eight families are recognized. The following include some of our common forms:
352. ORDER COCCOGONALES (COCCOGONEÆ).—Single-celled plants, occurring singly or in colonies, in some forms forming short threads. One of the two families is mentioned.