. The essentials of botany. Botany. CHAPTER XV PHYLUM IX. PTERIDOPHYTA* THE FERNS 449. The Ferns are green plants that as to their gametophytes are of smaller size than the Mossworts, while, as to their sporophytes they are much larger and more complex. In fact the gametophyte generation is so small compared with the sporophyte that it is usually overlooked, or when seen is often not recognized as a fern at all by those who are not familiar with the whole life cycle of these plants. The fern that we commonly see with its roots, solid stems, and ample leaves is the sporophyte generation, which
. The essentials of botany. Botany. CHAPTER XV PHYLUM IX. PTERIDOPHYTA* THE FERNS 449. The Ferns are green plants that as to their gametophytes are of smaller size than the Mossworts, while, as to their sporophytes they are much larger and more complex. In fact the gametophyte generation is so small compared with the sporophyte that it is usually overlooked, or when seen is often not recognized as a fern at all by those who are not familiar with the whole life cycle of these plants. The fern that we commonly see with its roots, solid stems, and ample leaves is the sporophyte generation, which has become so large and conspicuous in this phylum that it completely over- shadows the little gametophyte. 450. The gametophyte (commonly called the "pro- thallium") is usually a fiat thallus, of one or more layers of nearly uniform chlorophyll-bearing cells, the whole being rounded or heart-shaped in out- line. Its longitudinal axis is consider- Fia. 130—Game- ably thickened, and this portion is pro- tophytes. > ir r- vided underneath with many root-hairs, intermingled with which in most cases are the antherids and the archegones. 451. The antherids are nearly globular, few-celled * This name is here used in the narrower sense excluding Cala- mites and Lyoopods. 254. 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 Bessey, Charles E. (Charles Edwin), 1845-1915; Bessey, Ernst Athearn, 1877-1957. joint author. New York, H. Holt and company
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