Mosses congregate in shady, cool, damp places. Frequently they form dense, green cushions of many thousands of individual plants that are only recognizable when a clump is gently pulled apart. In many ways mosses are primitive organisms: they lack roots and vascular tissues (xylem and phloem); their leaves and stems have a simple anatomy, compared with higher plants; and because of an inability to form lignified, supportive tissues, they are low in stature. The little green moss plants are composed of haploid cells, having grown from haploid spores by mitotic divisions.
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