. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. V. MOSSES (MUSCI): SPHAGNALES—ANDREMALES 183 young protonema then has the form of a globular cell mass (Fig. 95, A). This stage recalls the corresponding one in many of the thallose Hepaticae, e. g., Pellia, Radiila, and is entirely different from the direct formation of the filamentous protonema of most Mosses. Some of the superficial cells of this primary tubercle grow out into slender filaments, either with straight or oblique septa, and these later ramify exten- sively. Where there are cre
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. V. MOSSES (MUSCI): SPHAGNALES—ANDREMALES 183 young protonema then has the form of a globular cell mass (Fig. 95, A). This stage recalls the corresponding one in many of the thallose Hepaticae, e. g., Pellia, Radiila, and is entirely different from the direct formation of the filamentous protonema of most Mosses. Some of the superficial cells of this primary tubercle grow out into slender filaments, either with straight or oblique septa, and these later ramify exten- sively. Where there are crevices in the rock, some of these branches grow into them as colourless rhizoids, but, as in the Bryales, there is no real morphological distinction between rhizoid and protonema. Most of the filamentous protonema! branches do not remain in this condition, but become trans- formed into cell plates or cylindrical cell masses, like the stem-. 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 Campbell, Douglas Houghton, 1859-1953. New York, The Macmillan Company;
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