. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. THE HOMOSPOROUS LEPTOSPORANGIAT^ 379 of phloem, separated from the endodermis by a broad pericycle. In other species of Hymenophyllum, Boodle (i) found a dif- ferent arrangement of the xylem and phloem. In some cases, e g., H. scabruni, there are two xylem plates, with the proto- xylem elements in the conjunctive tissues between them. In Trichomanes there is also a good deal of variation. Fig. 220, B, shows the structure in T. venosum, a small species from. Fig. 220.—'A, Section of the rhizome
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. THE HOMOSPOROUS LEPTOSPORANGIAT^ 379 of phloem, separated from the endodermis by a broad pericycle. In other species of Hymenophyllum, Boodle (i) found a dif- ferent arrangement of the xylem and phloem. In some cases, e g., H. scabruni, there are two xylem plates, with the proto- xylem elements in the conjunctive tissues between them. In Trichomanes there is also a good deal of variation. Fig. 220, B, shows the structure in T. venosum, a small species from. Fig. 220.—'A, Section of the rhizome of Hymenophyllum recurvum, X about 40; B, rhizome of Trichomanes venosum, X about 75; C. stele of B, more highly mag- nified; D, root of Hymenophyllum recurvum, X about 75; E, stele of the root more highly magnified. Australia and New Zealand. The structure of the stem dif- fers from that of Hymenophyllum recurvum, mainly in its greater delicacy. The sclerenchyma of the cortical region is less developed, and the concentric axial cylinder corresponding to its much smaller size has both the xylem and phloem reduced in amount. In the stouter species, like T. radicans, the amount of wood. 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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