Text-book of botany, morphological and physiological . Fig. 107.—Apicalrcgionof two primary shoots of maize. Apexof the very small-celled vegetative cone, out of which the leavesb, b, f>, b arise as multicellular protuberances, which soonembrace the stem, and envelope it and the younger leaves likea sheath. In the axil of the third youngest leaf b the youngestrudiment of a branchlet is visible as a roundish KiG. 108. — Longitudinal section of the apical region of the pri-mary stem of the sunflower, immediately before the formation of theflowers; a the apex of the broad punctu
Text-book of botany, morphological and physiological . Fig. 107.—Apicalrcgionof two primary shoots of maize. Apexof the very small-celled vegetative cone, out of which the leavesb, b, f>, b arise as multicellular protuberances, which soonembrace the stem, and envelope it and the younger leaves likea sheath. In the axil of the third youngest leaf b the youngestrudiment of a branchlet is visible as a roundish KiG. 108. — Longitudinal section of the apical region of the pri-mary stem of the sunflower, immediately before the formation of theflowers; a the apex of the broad punctum vesetationis; bb theyoungest leaves ; r the cortex ; w the pith. VegetationiSf never from those parts of the stem which already consist of fullydifferentiated tissues. In Characece,Mosses, &c., before or during the firstdivisions of their segments the leavesbecome visible close beneath the apicalcell, as protuberances, the outer portionconstituting an apical cell, out of thesegments of which are formed the Vascular Cryptogams a many-celledvegetative cone often overtops the young-est rudiment of a leaf { strong Equi-setum buds, Salvinia, many Ferns andSelaginellae). In Phanerogams (, 108, 109) this is general; in themthe rudiment of the leaf does not beginwith an apical cell standing out beyondthe vegetative cone, as in Cryptogams,but a roundish or broad cushion is formed, which from its
Size: 1495px × 1671px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1875
