. The elements of structural botany [microform] : with special reference to the study of Canadian plants, to which is added a selection of examination papers. Plant anatomy; Botany; Plantes; Botanique. TISSUE-HVSTEMi^, 171 form tho coverings? of }oung steuus, rn(,ts, and ler vey v, (2) Tii<: Fibn)ra^<ciiJAj£jt^y.^t('iii^ including such coinbina tions as form t.]»o st?'ingy masses which ahound iu su1)stjvnce of tho hij^lier plants ; and (3) The FwiidahicntuJ Sij^eiHy includnig tho combinations of cells which have undergone little or no change of form ; in short, all tlie rest of th
. The elements of structural botany [microform] : with special reference to the study of Canadian plants, to which is added a selection of examination papers. Plant anatomy; Botany; Plantes; Botanique. TISSUE-HVSTEMi^, 171 form tho coverings? of }oung steuus, rn(,ts, and ler vey v, (2) Tii<: Fibn)ra^<ciiJAj£jt^y.^t('iii^ including such coinbina tions as form t.]»o st?'ingy masses which ahound iu su1)stjvnce of tho hij^lier plants ; and (3) The FwiidahicntuJ Sij^eiHy includnig tho combinations of cells which have undergone little or no change of form ; in short, all tlie rest of the plant except the two systems fh'st numtioned. 292. The epidermal system is most highly devel- oped in l^hanerogams. Fig. 220 shows a section thi-ough the thickness of a leaf. Here Z^OdiCDCQQr. ' .it "v^ill be observed that there /I \nP~ y:*^ 'â " closely-packed layer of cells forming tho upper sur ^â â¢v-;^0 face, and a similar layer forin- incf the low(;r surface. These layers constitute ihacidd'rmis or skin of the leaf. The outer p.'irt of the epidermis is usu allv a continuous hu'er, and is known as tlie (â¢?ui^J'r It will be seen that the walls of these cells ⢠e mu^h thicker than those of the cells in the body of the leaf, and also that the epidermal cells, unlike the lutniior ones, have been emptied of theii orotophismic contents and are rectangular in shape. It sometim(!S happens that the epidermis consists of two or three layers instf^ad of one. The outgrowths of the epidermis, included uncar the general term trichonies, have already been referred to ; they must be regarded as part of the epidermal system. Fifj. 226. â Cross-section of a leaf, showi'ijf epidermis abovo and below, palisade cells under the np]>er opiil'Tniis, and loose tissue with intercellular spaces below the palisade cells. (^ 1'^ ii. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colora
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Keywords: ., book, bookcentury1800, booksubjectbotany, booksubjectplantanatomy
