Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 556
; figs. 5,6, 10), the breadth more nearly equals the length. In the former thezygospores are smooth, whilst in the latter they are very commonlyspinous (PI. VIII, figs. 1,4) and are sometimes quadrate. In this groupthe chief secondary characters are derived from the degree of con-striction between… … surrounded by gelatinous envelope ; B, dividingcell; C, single cell viewed transversely; D, twocells in conjugation ; E, formation of zygospore. 5i6 MICROSCOPIC FORMS OF VEGETABLE LIFE motion of the water be very slow, but are to be looked for in stand-ing though not stagnant waters. Small shallow…
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