. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 5o6 MOSSES AND FERNS CHAP. the original apical cell, but this becomes obliterated previous to the formation of the two branches, and two new initial cells are formed quite independently of it. The tissues of the Psilotacese are quite simple (Russow (i), Pritzel (i), Ford (i)). The most recent account is by Miss Ford, who has made a very complete study of the tissues of Psilotum triquetrum. The surface of the aerial shoot is strongly ribbed (Fig. 293, A) in the stouter portions, but nearly tria
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 5o6 MOSSES AND FERNS CHAP. the original apical cell, but this becomes obliterated previous to the formation of the two branches, and two new initial cells are formed quite independently of it. The tissues of the Psilotacese are quite simple (Russow (i), Pritzel (i), Ford (i)). The most recent account is by Miss Ford, who has made a very complete study of the tissues of Psilotum triquetrum. The surface of the aerial shoot is strongly ribbed (Fig. 293, A) in the stouter portions, but nearly triangular in section. Fig. 292—Psilotum triquetrum. A, Fragment of a subterranean, shoot with a young gemma (A), X120; B, longitudinal section of the apex of a subterranean shoot, Xi8s; C, transverse section of the apex of a subterranean shoot in the act of forking, x, x, the apical cells of the two branches, Xi8s (all figures after Solms-Laubach). nearer the apex. Within the epidermis, in which are numerous stomata, there is a zone of outer cortical cells, containing nu- merous chloroplasts, and constituting the principal assimilating tissue. The cells of this zone are irregular in outline, with numerous intercellular spaces, like the mesophyll of many leaves. Inside this assimilative cortex is a zone of scleren- chyma forming the principal mechanical tissue of the shoot. Within this zone is a mass of thin-walled parenchyma, bounded. 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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Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910
