. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 207 forking of the stem into two equal parts, a method of branching called dichotomy in contradistinction to the axial branching characteristic of the majority of our flowering plants. Fu^us, like many of the gross brown algae, contains air cavities or bladders-which buoy it up in the water; this feature accounts for its popular name of bladder wrack. A cross section of the stem shows that the tissues of these plants have attained a con- siderable differentiation (Fig. 122, A) as is attested by a rudi- 'f^cr. Fig. 122. Structura
. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 207 forking of the stem into two equal parts, a method of branching called dichotomy in contradistinction to the axial branching characteristic of the majority of our flowering plants. Fu^us, like many of the gross brown algae, contains air cavities or bladders-which buoy it up in the water; this feature accounts for its popular name of bladder wrack. A cross section of the stem shows that the tissues of these plants have attained a con- siderable differentiation (Fig. 122, A) as is attested by a rudi- 'f^cr. Fig. 122. Structural features of Fucus: A, cross-section of a portion of the central stem-like part of the plant, showing an epidermal, e, cortical, cr, and central region, c. B, section of one of the cavities that appears to the eye as a dot. See Fig. 121, B, g. This cavity contains only male game- tangia. C, section of a cavity from another plant contains only female game- tangia.—After Oltmann. mentary epidermal, cortical and central region, the latter often containing well-marked sieve tubes. These elongated cells of the central region promote the rapid distribution of materials and doubtless account in part for the size obtained by the kelps 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 Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
Size: 1586px × 1576px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisher, booksubjectbotany
