Text-book of botany, morphological and physiological . ntiation of its interior begins with the formation ofan annular intercellular space which separates off the wall of the theca consisting ofseveral layers of cells; but the wall remains attached above and below to the colu-mella. The intercellular space is traversed by rows of cells which stretch across fromthe wall of the theca to the inner mass of tissue; they resemble most nearly proto-nemal filaments, or those of Algae, but have been formed by simple differentiation of thetissue of the theca. They contain grains of chlorophyll like the
Text-book of botany, morphological and physiological . ntiation of its interior begins with the formation ofan annular intercellular space which separates off the wall of the theca consisting ofseveral layers of cells; but the wall remains attached above and below to the colu-mella. The intercellular space is traversed by rows of cells which stretch across fromthe wall of the theca to the inner mass of tissue; they resemble most nearly proto-nemal filaments, or those of Algae, but have been formed by simple differentiation of thetissue of the theca. They contain grains of chlorophyll like the inner cell-layers ofthe wall. The outer layer of the wall of the theca is developed into a very character-istic epidermis strongly cuticularised externally. The third or fourth layer of cells of theinner mass of tissue, which is thus separated from the annular air-cavity by two orthree layers of cells (forming the spore-sac), produces the mother-cells oif the are first of all distinguished by being densely filled with protoplasm, in which.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1875
