. Morphology of gymnosperms. Gymnosperms; Plant morphology. CYCADALES 139 I S3 to the endosperm, contains a substance related to pectin, toward the middle the pectin is replaced by cellulose, and the cellulose is replaced in turn by suberin in the outer part of the endospore, where it borders upon the suberized exo- spore. In structure the endospore is rather homogeneous, while the exospore is formed of little columns or fibrillae, which give it a dis- tinctly striated appearance (fig. 152). The outer walls of the endosperm cells bordering upon the endospore become suberized, and might some- t
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