. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 100 MOSSES AND FERNS CHAP, and-these lobes, according to Leitgeb's view, are very simple leaves/ In Fossombronia (Fig. 41, C, D), while the general thallose form is more or less evident, the leaves are unmistak- able, and as their development shows, morphologically the ^me as the leaves of the acrogynous forms. The most re- markable form, however, is Treubia insignis, a very large foliose Liverwort discovered by Goebel in Java. This has all the appearance of a very large acrogynous form, and a
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 100 MOSSES AND FERNS CHAP, and-these lobes, according to Leitgeb's view, are very simple leaves/ In Fossombronia (Fig. 41, C, D), while the general thallose form is more or less evident, the leaves are unmistak- able, and as their development shows, morphologically the ^me as the leaves of the acrogynous forms. The most re- markable form, however, is Treubia insignis, a very large foliose Liverwort discovered by Goebel in Java. This has all the appearance of a very large acrogynous form, and also the typical three-sided apical cell; but in regard to the position of the sexual or- gans it is typically ana- crogynous. These and the Haplomitriese forin a per- fect transition from the Anacrogynae to the Acro- gynse. The multicellular gem- mas of Blasia have been al- luded to. They are prox duced in long flask-shaped receptacles, and when ma- ture form nearly globular brownish bodies whose cells contain much oil, and whose stalk consists of a simple row of cells. Among them are glandular hairs, which secrete mucilage, by the swelling of which the gemmae are loosened from their pedicels, as in Mar- chantia. Similar but sim- pler gemmae having usually three cells occur in Treubia (Goebel (13)). Blasia is also characterised by the presence of colonies of Nostoc within the thallus. These occupy cavi- ties in the bases of the leaves and are normally always The Haplomitriece The two genera, Haplomitrium and Calobryum, which con-. FiG. 48.—A, '.Young plant of Aneura pahnata X26S (after Leitgeb) ; B, three views of a young plant of Pellia calycina, X420 (Leitgeb).. 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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