. Elementary botany . Fig. 201. r lg. 200. Antheridium of mnium Section through end of stem of female plant of mnium, show- with jointed paraphysis ing archegonia at the center. One archegonium shows the egg. at the left; spermato- On the sides are sections of the protecting leaves. zoids at the right. slender stalk. Upon the capsule is a peculiar cap,* shaped like a ladle or spatula. This is the remnant of the old archegonium, which, for a time sur- rounded and protected the young embryo of the sporogonium, just as takes place in the liverworts. In most of the mosses this old remnant of the a
. Elementary botany . Fig. 201. r lg. 200. Antheridium of mnium Section through end of stem of female plant of mnium, show- with jointed paraphysis ing archegonia at the center. One archegonium shows the egg. at the left; spermato- On the sides are sections of the protecting leaves. zoids at the right. slender stalk. Upon the capsule is a peculiar cap,* shaped like a ladle or spatula. This is the remnant of the old archegonium, which, for a time sur- rounded and protected the young embryo of the sporogonium, just as takes place in the liverworts. In most of the mosses this old remnant of the arche- gonium is borne aloft on the capsule as a cap, while in the liverworts it is thrown to one side as the sporogonium elongates. 339. Structure of the moss capsule.—At the free end on the moss capsule * Called the calyptra.
Size: 2560px × 1953px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublisher, booksubjectbotany
