Elementary botany . E Fig. zonata. A, base of thread. B,cells with zoospores, C, one cell with zoosporesescaping another cell with small biciliategametes escaping and some fusing to formzygospores, E, zoospores spiforming threads: F £ zygospore growing and Chapter 15) and Drapernaudiaforming zoospores. (After Caldwell and Dodel- r j/ r Port.) in fresh water. 346. Family (Edogoniaceae, represented by (Edogonium (Chapter 16). 347. Family Coleochaetaceae, represented by Coleochaete (Chapter 17). 348. Subclass SIPHONED.—There are several families. 349. Family Botrydiaceae.—This is rep
Elementary botany . E Fig. zonata. A, base of thread. B,cells with zoospores, C, one cell with zoosporesescaping another cell with small biciliategametes escaping and some fusing to formzygospores, E, zoospores spiforming threads: F £ zygospore growing and Chapter 15) and Drapernaudiaforming zoospores. (After Caldwell and Dodel- r j/ r Port.) in fresh water. 346. Family (Edogoniaceae, represented by (Edogonium (Chapter 16). 347. Family Coleochaetaceae, represented by Coleochaete (Chapter 17). 348. Subclass SIPHONED.—There are several families. 349. Family Botrydiaceae.—This is represented by Botrydium granu-latum (Chapter 15, p. 146). 350. Family Vaucheriaceae, represented by Vaucheria (Chapter 15), withquite a large number of species, is widely distributed. ALGM CONTINUED: CLASSIFICATION. 163. Class Schizophyceae (=Cyanophyceae). 351. The Blue-Green Algae, or Cyanophyceae form slimy looking thinmats on damp wood or the ground, or floating mats or scum on the color is usually bluish green, but in some species it is purple, red orbrown. All have chlorophyll, but it is not in distinct chloroplasts and ismore or less completely guised by the presence of other pigments. Twoorders and eight families are recognized. The following include some ofour common forms: 352. ORDER COCCOGONALES (COCCOGONEJE).—Single-celled plants,occurring singly or in colonies, in some formsforming short threads. One of the two fami-lies is mentioned. 353. Family Chroococcaceae. — The plantsmultiply only through cell division. Chroococ-cus, forms rounded, blue-green cells enclosedin a thick gelatinous coat, in fresh water andin damp places; certain species form lichen-gonidia in some genera of lichens. Gloeo-capsa is similar i;o Chroococcus, but the col-onies are surrounded by an additional
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