. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. vm MARATTIALES 297 shrinking of the cells on either side of the opening slit. The latter in Dancea is short, and finally appears like a circular pore, but is really not essentially different from that in Kaulfussia and Marattia. In the latter there is a mechanical tissue which causes the two valves of the synangium to gape widely at ma- turity, and the dehiscence of the individual loculi is effected by. Fig. i68.—Archangiopteris Henryi. A, Entire sterile leaf, reduced; B, base of stipe, showin
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. vm MARATTIALES 297 shrinking of the cells on either side of the opening slit. The latter in Dancea is short, and finally appears like a circular pore, but is really not essentially different from that in Kaulfussia and Marattia. In the latter there is a mechanical tissue which causes the two valves of the synangium to gape widely at ma- turity, and the dehiscence of the individual loculi is effected by. Fig. i68.—Archangiopteris Henryi. A, Entire sterile leaf, reduced; B, base of stipe, showing the stipules; C, part of a fertile pinna, of the natural size. (After Christ & Giesenhagen.) the contraction of thinner walled cells surrounded by firmer tissue. The number of spores produced in each loculus is approx- imately 1750 for Danaa, 7500 for Kaulfussia, 2500 for Marat- tia, and 1450 for Angiopteris. Bower's account and figures of Angiopteris differ from the specimens examined by the writer in the greater thickness of. 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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