. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 224 MOSSES AND FERNS CHAP. The male inflorescence of the Polytrichaceae is especially conspicuous, as the leaves immediately surrounding the anther- idia are different both in form and colour from those of the stem. They are broad and membranaceous, and more or less distinctly reddish in colour. A well-known peculiarity of these forms is the fact that the growth of the stem is not stopped by the formation of antheridia, but after the latter have all been formed the axis resumes its growth and
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 224 MOSSES AND FERNS CHAP. The male inflorescence of the Polytrichaceae is especially conspicuous, as the leaves immediately surrounding the anther- idia are different both in form and colour from those of the stem. They are broad and membranaceous, and more or less distinctly reddish in colour. A well-known peculiarity of these forms is the fact that the growth of the stem is not stopped by the formation of antheridia, but after the latter have all been formed the axis resumes its growth and assumes the character of an ordinary leafy shoot. This, of course, indi- cates that, unlike most of the â Mosses, the apical cell does not become transformed into an antheridium, and the researches of. Fig. 122.âDawsonia superba. A, Transverse section of the stem, X3S; B, part of the central cylinder, showing water-conducting elements, t, X200; C, outer tissues of the stem, X200. Hofmeister (2), Leitgeb (9), and Goebel (7) have shown that this is the case. The antheridia form groups at the base of each leaf of the inflorescence, and Leitgeb thinks it probable that each group represents a branch, i. e., the inflorescence is a compound structure, and not directly comparable to the simple male inflorescence of Funaria. The sporogonium in Poly- trichum has a large intercellular space between the inner spore- sac and columella as well as the one outside the outer spore-sac. In both cases the space is traversed by the conferva-like green filaments found in the other stegocarpous Mosses. The apoph- ysis is well developed, especially in Polytrichum, and the. 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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