Text-book of structural and physiological botany . s greatly; the maximum appears 200 Structural and Physiological Botany. to occur in Didymium Serpida, where a rate of lo millimetres in a minute has been observed. The aiitherozoids and swarmspores (zoospores) of many Cryptogams were long considered to belong to the animal kingdom ; and they actually show so close a resemblance to animals that they might well have been described as plants in the moment of their transformation into animals. The swarmspores of Algae are particles of protoplasm which break through the walls of the cells in which
Text-book of structural and physiological botany . s greatly; the maximum appears 200 Structural and Physiological Botany. to occur in Didymium Serpida, where a rate of lo millimetres in a minute has been observed. The aiitherozoids and swarmspores (zoospores) of many Cryptogams were long considered to belong to the animal kingdom ; and they actually show so close a resemblance to animals that they might well have been described as plants in the moment of their transformation into animals. The swarmspores of Algae are particles of protoplasm which break through the walls of the cells in which they are formed, and swim about for a time in water like animals. It is only since it has been ascertained that they give birth, after a shorter or longer period of rest, to a plant of the same species as that from which they sprang, that their vegetable nature has been absolutely determined. The internal forces by which these swarmspores (Fig. 385, p. 252), and the antherozoids (Fig. 371) which are endowed with motion of a similar nature, I.
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