. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. MARATTIALES 293 between. In each half there are differentiated the separate archesporial groups of cells corresponding to the separate chambers found in the complete ; The whole process takes, according to his account, about six months. Luerssen was unable either in Marattia or Angiopteris to trace back the archesporium to a single cell, which Goebel (3) claims is present in the latter. In Angiopteris the process begins as in Marattia^ but at a period when the leaf is almost com
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. MARATTIALES 293 between. In each half there are differentiated the separate archesporial groups of cells corresponding to the separate chambers found in the complete ; The whole process takes, according to his account, about six months. Luerssen was unable either in Marattia or Angiopteris to trace back the archesporium to a single cell, which Goebel (3) claims is present in the latter. In Angiopteris the process begins as in Marattia^ but at a period when the leaf is almost completely developed and. Fig. 164.—Angiopteris cvecta. Development of the sporangium. A, Vertical section of very young receptacle; B, similar section of an older sporangium in which the archesporium is already developed (after Goebel); C, longitudinal section of an almost fully-developed sporangium, showing the persistent tapetal cells (0; f, the annulus, X75. unfolded. The first indication of the young sorus is the formation of an oblong depression above a young vein, and about the border of this are numerous short hairs, which as a rule are absent from the epidermis of the leaf (Fig. 164, A). The placenta is formed as in Marattia, but instead of the two parallel ridges that are found in the latter, the young sporangia arise separately, much as in Botrychium. As in the latter too, Goebel states that the archesporium can be traced to a single. 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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