Text-book of structural and physiological botany . Fig. 58.—A family of PediastrumroHi-fa (an Alga) consisting of eightcells, (x 250.). Fig. 59.—Plezcrococctis sttperhtis \ <t a family of four cells; the cells themselves arenaked, but the whole family is enclosed in a common cell-wall consisting of sixlayers ; b each cell has developed a separate cell-wall; c the original cell-wallshave burst, and the separate cells have become free ; they continue for some timein motion, then come to rest, and develope new families. (After Cienkowski, x 320.) this motion ceases, the sister-cells place them
Text-book of structural and physiological botany . Fig. 58.—A family of PediastrumroHi-fa (an Alga) consisting of eightcells, (x 250.). Fig. 59.—Plezcrococctis sttperhtis \ <t a family of four cells; the cells themselves arenaked, but the whole family is enclosed in a common cell-wall consisting of sixlayers ; b each cell has developed a separate cell-wall; c the original cell-wallshave burst, and the separate cells have become free ; they continue for some timein motion, then come to rest, and develope new families. (After Cienkowski, x 320.) this motion ceases, the sister-cells place themselves togetherso as to form a plate, and produce in their development anew colony. Cell-families occur only in the lowest classesof plants, the Algae and Fungi (Fig. 59). The union of cells into tissues and cellfusions is perma-nent, and is combined with a limitation in various ways of the 38 Structural and Physiological Botany. functions of the separate cells. In the former the cells uniteonly into a group, the elements (separate cells) of which canstill be easily recognised, and still possess a certain individu-
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