. The microscope and its revelations. FIGS. 552 and 553.—Tran-verse and vertical -en ions of a fossil wood,showing the separation of the woody plates, a a, a a, by the verylarge medullary rays, b b, b b. extremities of the medullary rays occupy a very large part ofthe area, having apparently determined the >iuuus ce of theprosenchymatous cells, instead of looking (as in iig .~>4S) as if they zz -2 708 MICROSCOPIC STRUCTURE OF PHANEROGAMIC PLANTS had forced their way between these cells, which there hold a nearlystraight and parallel course on either side of them. The medullarvrays mainta
. The microscope and its revelations. FIGS. 552 and 553.—Tran-verse and vertical -en ions of a fossil wood,showing the separation of the woody plates, a a, a a, by the verylarge medullary rays, b b, b b. extremities of the medullary rays occupy a very large part ofthe area, having apparently determined the >iuuus ce of theprosenchymatous cells, instead of looking (as in iig .~>4S) as if they zz -2 708 MICROSCOPIC STRUCTURE OF PHANEROGAMIC PLANTS had forced their way between these cells, which there hold a nearlystraight and parallel course on either side of them. The medullarvrays maintain a connection between the external and the internalparts of the cellular tissue or fundamental parenchyme (also called ground-tissue) of the stem, which have been separated by theinterposition of the wood. The bark is usually found to consist of three principal layers :the external or epiphlceum, which includes the suherous (or corky)layer; the middle, or mesophloeum, also termed the cellular envelope ;and the
Size: 1338px × 1867px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
