. Botany for high schools and colleges. Botany. 78 BOTANY. (c) Examples of the simpler forms of laticiferous tissue may be ob- tained for study from Euphorbiacem, Urticacece, AsdejnadacecB, Apocy- nacecB. Forms less simple occur in AracecB, and in the maple ; in the last-mentioned they appear to replace the sieve-vessels. Related to these again are the peculiar milk-vessels of the onion (Fig. 06), which consist of elongated cells separated by thin or perforated Fig. 67. — Longitudinal section through the sieve tissue of Cucurbita Pepo. Q, q, section of transverse sieve - plates ; si, l
. Botany for high schools and colleges. Botany. 78 BOTANY. (c) Examples of the simpler forms of laticiferous tissue may be ob- tained for study from Euphorbiacem, Urticacece, AsdejnadacecB, Apocy- nacecB. Forms less simple occur in AracecB, and in the maple ; in the last-mentioned they appear to replace the sieve-vessels. Related to these again are the peculiar milk-vessels of the onion (Fig. 06), which consist of elongated cells separated by thin or perforated Fig. 67. — Longitudinal section through the sieve tissue of Cucurbita Pepo. Q, q, section of transverse sieve - plates ; si, lateral sieve-plate ; x, thin places in wall ; I, the same seen in section; ^;5, protoplasmic contents contracted by the alcohol in which the speci- mens were soaked ; sp, pro- toplasm lifted off from the sieve-piale by contraction ; si, protoplasm still in con- tact with the sieve-plate ; ?, parenchyma between sieve tubes, X 550. —After Sachs. {d) The more complex or reticulated forms of laticiferous tissue occur in Cichoriacece, Campanulacece, Loheliacece, ConvolvulacecE, Pa- yaveracece. {e) By heating thin sections of any of the foregoing plants in a di- lute solution of potash the laticiferous tissues may be readily isolated for study. 0 ) The walls of the laticiferous elements are always rich in water, and are composed of cellulose, as may be shown by the blue coloration which follows treatment with Schultz's 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 Bessey, Charles Edwin, 1845- [from old catalog]. New York, H. Holt and company
Size: 1140px × 2193px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisher, booksubjectbotany
