. A handbook of cryptogamic botany. Cryptogams. 152 MUSCINE^ the single layer of cells of which it is composed becomes differentiated' into cells of two distinct kinds. A comparatively small number, of a lozenge-shaped form, grow to a large size and lose the whole of their con- tents, while their walls are provided with spiral thickening-bands, and fre- quently display a large circular orifice opening from one cell into the next. A much larger number of cells remain permanently of a very small size, are very narrow in proportion to their length, and, being filled with protoplasm and chlorophyl
. A handbook of cryptogamic botany. Cryptogams. 152 MUSCINE^ the single layer of cells of which it is composed becomes differentiated' into cells of two distinct kinds. A comparatively small number, of a lozenge-shaped form, grow to a large size and lose the whole of their con- tents, while their walls are provided with spiral thickening-bands, and fre- quently display a large circular orifice opening from one cell into the next. A much larger number of cells remain permanently of a very small size, are very narrow in proportion to their length, and, being filled with protoplasm and chlorophyll, constitute the whole of the nutritive tissue of the leaf. These nutritive cells form a kind of network ramifying among the large empty cells ; but, as their total area is small com- pared with these latter, the entire leaf has, to the naked eye, a semi-trans- parent very light yellow-green appear- ance. The tissue of the stem consists of cells of three distinct kinds. In the centre is a cylinder of thin-walled elongated colourless parenchymatous Fig. T^i—S^Jtagnum aciitifolium Ehrh. ,, , . ... , . ^, megaspore; £, microspore; c, proto- cells J this IS cnvcloped m a layer 01 neme, with^.rudimenK of young plants j ^^ j 1, ^ ii ^l. 11 (magnined). (After Schimper.) dotted proscnchymatous cells, the walls. 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 Bennett, Alfred W. (Alfred William), 1833-1902; Murray, George Robert Milne, 1858-. London, New York, Longmans, Green, and Co.
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