. Plants and their uses; an introduction to botany . i:e and lives as a parasite, thefoot or lower end of the staUc serving as an haustorium. Especial interest attaches to the genus Anthoceros (often calledhorned livem-orts from the form of the sporophjte), because thesehumble plants have preser\ed structures which help us to under-stand how all the higher plants may have originated. The game- 1 E-later < Gr. elater, a driver. 518 LIFE-HISTORIES. Fig. 341, I.—Umbrella-liverwort. Female plant (J), Ixuring archegonia-carricrs {archegoniophores). (Atkinson.) tophytc from a spore in
. Plants and their uses; an introduction to botany . i:e and lives as a parasite, thefoot or lower end of the staUc serving as an haustorium. Especial interest attaches to the genus Anthoceros (often calledhorned livem-orts from the form of the sporophjte), because thesehumble plants have preser\ed structures which help us to under-stand how all the higher plants may have originated. The game- 1 E-later < Gr. elater, a driver. 518 LIFE-HISTORIES. Fig. 341, I.—Umbrella-liverwort. Female plant (J), Ixuring archegonia-carricrs {archegoniophores). (Atkinson.) tophytc from a spore in much the same way as happenswith the other Hverworts described. Even more than in Hiccia it the thalhis of Coleochiete, notably in possessing but a singlechromatophore in each cell, and in having no trace of pseudo-leaves(Fig. 343). The gametangia are completely embedded in the thallus(Fig. 344). The embryo (E) develops a somewhat expanded footwhich serves to hold the slender .sporophjte in an upright position,and functions also as an organ of absorption. As the sijorophyfecontinues to grow, however, it is plain that scarcely more thaninorganic materials arc taken in; for ver3 soon, above the foot ap-pears an elongating zone of tissue containing much chlorophyll;and this enables the sporophyte to photosynthesizc and ,so, unlikeour other liverworts, to be almost )orting. If an Antbero-ceros sporophyte should ever develop a
Size: 1516px × 1647px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
