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pteridophyta's Usage Examples:

Full morphological and organographical details are given in the articles on the various groups of plants, such as those on the Algae, Bryophyta, Pteridophyta, Angiosperms, Gymnosperms, 'c. The following works may also be consulted:

Moreover, had the evolution of plants proceeded along the line of adaptation, the vegetable kingdom could not be subdivided, as it is, into the morphological groups Thallophyta, Bryophyta, Pteridophyta, Phanerogamia, but only into physiological groups, Xerophyta, Hygrophyta, Tropophyta, 'c.

Thus in the series Bryophyta, Pteridophyta, Phanerogamia, whilst the sporophyte presents progressive development, the gametophyte presents continuous reduction.

In this, as in all morphological inquiries, two lines of investigation have to be followed, the phylogenetic and the ontogenetic. Beginning with its phylogeny, it appears, so far as present knowledge goes, that the differentiation of the shoot of the sporophyte into stem and leaf first occurred in the Pteridophyta; and, in accordance with the views of Bower (Origin of a Land..

Companion cells are not found in the Pteridophyta and Gymnosperms. In the latter their place is taken by certain cells of the medullary rays and bast parenchyma.

The Spermatophyta fall into two classes, Gymncsperms (q.v.) and Angiosperms; the former are the more primitive group, appearing earlier in geological time and showing more resemblance in the course of their life-history to the Pteridophyta.

The male gametophyte is represented by one or few cells and, except in a few primitive forms where the male cell still retains the motile character as in the Pteridophyta, is carried passively to the macrospore in a development of the pollen grain, the pollen tube.

The spores, as in the heterosporous Pteridophyta, are of two kindsmicrospores (pollen grains) borne in microsporangia (pollen sacs) on special leaves (sporophylls) known as stamens, and macrospores (embryo-sac) borne in macrosporangia (ovules) on sporophylls known as carpels.

The sporophyte is the plant which is differentiated into stem, leaf and root, which show a wonderful variety 01 form; the internal structure also shows increased complexity and variety as compared with the other group of vascular plants, the Pteridophyta.

Pteridophyta.

pteridophyta's Meaning':

containing all the vascular plants that do not bear seeds: ferns horsetails club mosses and whisk ferns; in some classifications considered a subdivision of Tracheophyta

Synonyms:

class Lycopodiate, plant kingdom, Sphenopsida, fern genus, order Psilophytales, Plantae, Lycopodiate, class Equisetatae, Psilopsida, Filicopsida, pteridophyte, Equisetatae, Psilotatae, class Psilopsida, class Psilotatae, Filicinae, division Pteridophyta, division, nonflowering plant, fern family, class Lycopsida, Lycopsida, genus Pecopteris, class Filicinae, class Sphenopsida, kingdom Plantae, class Filicopsida, Psilophytales,

Antonyms:

Phanerogamae, Cryptogamia, end, misconception, beginning,