. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 3o8 MOSSES AND FERNS CHAP. tached. In this way, as well as by the separation of ordinary branches, the prothallia of some species of Hytnenophyllum form dense mats several inches in diameter, which look exactly like a delicate Liverwort. A most remarkable case is that of Anogramme leptophylla, examined by Goebel (i). The pro- thallium multiplies extensively by buds, some of which form tuber-like resting bodies, by which the prothallium becomes perennial. The sporophyte in this species is annua
. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. 3o8 MOSSES AND FERNS CHAP. tached. In this way, as well as by the separation of ordinary branches, the prothallia of some species of Hytnenophyllum form dense mats several inches in diameter, which look exactly like a delicate Liverwort. A most remarkable case is that of Anogramme leptophylla, examined by Goebel (i). The pro- thallium multiplies extensively by buds, some of which form tuber-like resting bodies, by which the prothallium becomes perennial. The sporophyte in this species is annual and dies as soon as the spores ripen. The archegonia are borne on special branches of the prothallium, which penetrate into the ground and lose their chlorophyll. Goebel ((lo) p. 245) suggests B. It hi ^••It ,i-N Js. I^M i^^ mjn— "> >. Fig. 171.—A, Prothallium of Pteris cretica, with the sporophyte, sp, arising as a veg- etative bud; B, apex of the root of Asplenium esculentum, developing into a leafy shoot. (A, after De Bary; B, after Rostowzew.) what seems very probable, that the subterranean prothallium of the Ophioglossaceae may be of this nature, and the fact that in Botrychium Virginianum the germinating spore develops chlorophyll would point to this. Apogamy and Apospory Apogamy, or the development of the sporophyte from the prothallium as a vegetative bud, was first discovered by Farlow (i) and later investigated by De Bary (2), Leitgeb (13), and Sadebeck (6). It is known at present in Pteris Cretica, As-. 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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