. The elements of botany embracing organography, histology, vegetable physiology, systematic botany and economic botany ... together with a complete glossary of botanical terms. Botany. TISSUE. 89. serve as resin canals (Fig. 202, transverse section); in the Composite, where they are oil-passages; and in the Umbelliferce, -where they are filled with a mixture of gum-muci- lage, and oily or resin- ous substances. The adjacent cells may as- sume the function of glands, and secrete the 202 substances found in the canals. The large air canals in many water plants are intercellular spaces, whose or
. The elements of botany embracing organography, histology, vegetable physiology, systematic botany and economic botany ... together with a complete glossary of botanical terms. Botany. TISSUE. 89. serve as resin canals (Fig. 202, transverse section); in the Composite, where they are oil-passages; and in the Umbelliferce, -where they are filled with a mixture of gum-muci- lage, and oily or resin- ous substances. The adjacent cells may as- sume the function of glands, and secrete the 202 substances found in the canals. The large air canals in many water plants are intercellular spaces, whose origin is referable to the split- ting apart of cells. But the large cavities in the stems of many plants (as Grasses and Umbelliferee) arise by a break- ing of some of the cells. 114. Although the several kinds of tissue merge into one another, they may generally be referred to two typical forms, namely, parenchyma and prosenchyma. In parenchyma the cells are polyhedrical and generally isodiametric; or, if elongated, the ends are truncate, or, at least, never pointed and wedged into one another (Fig. 203). The tissue of some Fungi, formed of hy- phse, or threads placed close- ly together, resembles paren- chymous tissue, and is called ' Fig. 202. Transverse section of a Pine leaf, showing a Resin canal (); st, stomata: hy, hypoderm; cA/, chlorophyll; a, air-cavity. Fig. 203. Section of a Potato leaf, showing Parenchyma; e^, epidermis; l«, intercellular spaces; cA/, 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 Kellerman, William Ashbrook, 1850-1908. Philadelphia, J. E. Potter and Company
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbotany, bookyear1883
