Text-book of structural and physiological botany . lls are visibleon the cell-wall. ( x 500.) Fig. 32. — Annular cellfrom A rundo donax,with strongly thickenedrings placed at differentdistances and differentangles, (x 400.) sequently often takes place only on one side (Fig. 21), or soslightly at particular spots \h^t pitted ox pore-canals are formedat those spots. These are sometimes simple (Figs. 19, 20),sometimes branched (Fig. 25). The canals from adjoiningcells constantly meet; sometimes they are widened at theirbase into bordered pits (Fig. 22); and the membrane betweenthese frequently di
Text-book of structural and physiological botany . lls are visibleon the cell-wall. ( x 500.) Fig. 32. — Annular cellfrom A rundo donax,with strongly thickenedrings placed at differentdistances and differentangles, (x 400.) sequently often takes place only on one side (Fig. 21), or soslightly at particular spots \h^t pitted ox pore-canals are formedat those spots. These are sometimes simple (Figs. 19, 20),sometimes branched (Fig. 25). The canals from adjoiningcells constantly meet; sometimes they are widened at theirbase into bordered pits (Fig. 22); and the membrane betweenthese frequently disappears, so that cells become thus actuallyperforated (Figs. 23, 24). According to the development of c 2 20 Structural and Physiological Botany. the pits or of the thickening-layers we distinguish betweenpitted cells (Fig. 27), cells (Fig. 28), spiral cells(Figs 29, 30), annular cells (Figs. 31-34), and scaanformladder-like) ../A (Fig. 36). Pitted cells, which are fnrmshedin addition with spiral, reticulate, or annular thickening-.
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Keywords: ., bookcentury1800, bookdecade1870, bookpublishernewyorkjwileysons
