. Elementary botany. Botany. 3o8 MORPHOLOGY. ize the embryo which pushes its way into the endosperm from which it derives its food (tig. 362). 626. Homology of the parts of the female cone.^—Opinions are divided as to the homology of the parts of the female cone of the pine. Some consider the entire cone to be homologous with a flower of the angiosperms. The. Fig. ,^0i. Archegonium nf white riine at stage ijf fertilization, en, egg nucleus; spn. sperm nucleus in ctmjugatiMn with it; n6, nutritive bodies in cytoplasm of large egg; cpt, cavity of pollen tube; vn, vegetative nucleus or tube nucle
. Elementary botany. Botany. 3o8 MORPHOLOGY. ize the embryo which pushes its way into the endosperm from which it derives its food (tig. 362). 626. Homology of the parts of the female cone.^—Opinions are divided as to the homology of the parts of the female cone of the pine. Some consider the entire cone to be homologous with a flower of the angiosperms. The. Fig. ,^0i. Archegonium nf white riine at stage ijf fertilization, en, egg nucleus; spn. sperm nucleus in ctmjugatiMn with it; n6, nutritive bodies in cytoplasm of large egg; cpt, cavity of pollen tube; vn, vegetative nucleus or tube nucleus; sc. stalk cell; spn, second sperm nucleus: pr, portion i>f prothallium or endusperm; 5^7. starch grains in tube. The sheath of jacket cells of the archegDuium is n^t shown. (Alter Ferguson.) entire scale according to this view is a carpel, or sporophvll, which is divided into the cover scale and the ovuliferous scale. This division of the sjiom- y^h\ll is considered similar to (hat whii h we have in isoctes, where the spo- rnphyll has a ligule above tlie sporangium, or as in ophioglossum, where the leaf is divided into a fertile and a sterile j)ortion. Others ln-lieve that the ovuliferous siale is composed of two leaves situ- ated ialerally and ( onsoHdaled representing a shont in the axis of the bract. T'here is some suppoii \i->\' thi-. in Ihe f,u 1 that in (ciiain abinuanal cones which show jirolifcTation a sliort axis ai^jicars in the axil c>f the l) and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Atkinson, George Francis, 1854-1918. New York : H. Holt
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