. Outlines of plant life : with special reference to form and function . Botany. LIVERWORTS AND MOSSES. 47 ing the whole of the outer region occupied by a distinct mass of mechanical tissue for stiffening the stem, and, near the center, a strand known as " conducting tissue," which may act as a line of transfer for water or Fig. , gametophyte of Polytrichutn commune^ with rhizoids below. B, gameto- phyte of Hylocomium sphndens, bearing three sporophytes near top. Natural size. —^After Kemer. 57. The leaves are also more highly developed than in liverworts. They are alway
. Outlines of plant life : with special reference to form and function . Botany. LIVERWORTS AND MOSSES. 47 ing the whole of the outer region occupied by a distinct mass of mechanical tissue for stiffening the stem, and, near the center, a strand known as " conducting tissue," which may act as a line of transfer for water or Fig. , gametophyte of Polytrichutn commune^ with rhizoids below. B, gameto- phyte of Hylocomium sphndens, bearing three sporophytes near top. Natural size. —^After Kemer. 57. The leaves are also more highly developed than in liverworts. They are always sessile and are arranged in two (rarely), three, or more vertical ranks along the stem, and consist usually of a single sheet of green cells, the blade (figs. 43, 44), and a central rib running from base to apex (fre- quently wanting), which is composed of elongated conduct- ing and strengthening cells (figs. 43, 44). In some the. 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 Barnes, Charles Reid, 1858-1910. New York : Henry Holt and Company
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