. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. THE HOMOSPOROUS LEPTOSPORANGIAT^ 371 may divide (Fig. 211). At this stage there is a marked re- semblance to the sporangium of Angiopteris, and Bower calls attention to the similarity in form between the sorus of Gleich- enia and that of the Marattiacese. The walls of the inner tapetal cells are finally absorbed. The number of sporogenous cells is large, the number of spores in G. Hahellata amounting sometimes to over 800. In G. dichotoma (Fig. 212) the sporangia form rounded naked sori above
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. THE HOMOSPOROUS LEPTOSPORANGIAT^ 371 may divide (Fig. 211). At this stage there is a marked re- semblance to the sporangium of Angiopteris, and Bower calls attention to the similarity in form between the sorus of Gleich- enia and that of the Marattiacese. The walls of the inner tapetal cells are finally absorbed. The number of sporogenous cells is large, the number of spores in G. Hahellata amounting sometimes to over 800. In G. dichotoma (Fig. 212) the sporangia form rounded naked sori above the terminal branch of a lateral vein. They are pear-shaped, with a very short stalk, and upon the outer surface is a nearly complete very distinct annulus composed of. Fig. 213.—Matonia pectinata. A, Base of fertile pinna, X3; B, section of the sorus; C, open sporangium, X3S; D, section of rhizome, Xio. (A, B, after Diels; D, after Seward.) a single row of large thick-walled cells. This is interrupted at the top of the sporangium by three or four narrow thin- walled cells, and starting from this point and extending along the median line of the ventral surface are two rows of narrow cells, between which the, sporangium opens. The Matoniace^ The family Matoniaceas is represented by the single genus Matonia (Fig. 213), with two species, M. pectinata M. sar-. 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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