. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. Ill THE JUNGERMANNIALES Elatereae 8s "Aneura and Metsgeria represent the simplest of the typical anacrogynous Jungermanniales. In the former the thallus is composed of absolutely similar cells, all chlorophyll-bearing, and in each cell one or more oil bodies, like those of the Mar- chantiacese. In Metzgeria (Fig. 37) the wings of the thallus are but one cell thick, and there is a very definite midrib, usu- ally four cells thick. The apical growth in both genera is. Fig. 37.—Metzgeria pube
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. Ill THE JUNGERMANNIALES Elatereae 8s "Aneura and Metsgeria represent the simplest of the typical anacrogynous Jungermanniales. In the former the thallus is composed of absolutely similar cells, all chlorophyll-bearing, and in each cell one or more oil bodies, like those of the Mar- chantiacese. In Metzgeria (Fig. 37) the wings of the thallus are but one cell thick, and there is a very definite midrib, usu- ally four cells thick. The apical growth in both genera is. Fig. 37.—Metzgeria pubescens. A, Surface view of the thallus in process of division, X80; B, growing point of a branch showing the two-sided apical cell (;r) and the ventral hairs (,h), X240; C, the growing point in process of division, x, x", the apical cells of the two branches, X480. the same, and is effected by the growth of a "two-sided" apical cell.^ The segmentation is very regular, especially in Metzgeria (Fig. 37), where each of the segments divides first into an inner and an outer cell, the former by subsequent divi- sions parallel to the surface of the thallus producing the thick- 'Leitgeh (7), vol. 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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