. A compendium of general botany. Plants. 48 COMPENDIUM OF GENERAL BOTANY. C. The Lichen-Type.—A collection of cell-filaments form a cell- body with an apical cone similar to the ones just mentioned. The filaments lying immediately about the axis in which growth pro- ceeds divide continuously. Those lying some distance from the axis of growth seldom branch. In this form of growth any given point not lying at the apex moves forward in an " orthogonal trajectory " until the cell-body has acquired its definitive width. The following question is important as pertaining to the sub- ject u
. A compendium of general botany. Plants. 48 COMPENDIUM OF GENERAL BOTANY. C. The Lichen-Type.—A collection of cell-filaments form a cell- body with an apical cone similar to the ones just mentioned. The filaments lying immediately about the axis in which growth pro- ceeds divide continuously. Those lying some distance from the axis of growth seldom branch. In this form of growth any given point not lying at the apex moves forward in an " orthogonal trajectory " until the cell-body has acquired its definitive width. The following question is important as pertaining to the sub- ject under discussion in this chapter. How is a tissue of similar, that is, of equally large, cells con- verted into a tissue of unequally large cells ? Three methods will be mentioned as being especially important: (1) inequality in the length of the cell-wall formation of contiguous cells (see Fig. 30, A) \ (2) unequal growth of contiguous cells (Fig. 31); with this condition is very closely allied the so-called gliding groivth, a phenomenon of which Krabbe has recently made a special study ; (3) division in cells of equal growth may cease at different periods of time. The elongated cells in Fig. 30, B^ are formed in this B -1 - _ _ X I. 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 Westermaier, Max; Schneider, Albert, 1863-1928. New York : Wiley
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectplants, bookyear1896
