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pteridophyta

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Filicopsida

Overview page. Subjects: Plant Sciences and Forestry.

A subdivision of the Pteridophyta, which comprises all living and extinct ferns. They arose in the Devonian from the Trimerophytina group of psilophytes and made an important contribution...

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Isoetaceae

Overview page. Subjects: Plant Sciences and Forestry.

A family of Pteridophyta, mostly aquatic vascular cryptogams with 2 types of spore (see heterospory). They have a short, stout, basal stock from which arise the roots below, and a dense...

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Lycopodiaceae

Overview page. Subjects: Plant Sciences and Forestry.

A family of Lycopsida within the Pteridophyta, with small, simple, usually narrow leaves, which clothe the forking stems or, as in Phylloglossum, arise from the base of the naked,...

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Lycopsida

Overview page. Subjects: Earth Sciences and Geography.

Class of the Pteridophytina, represented today by relatively small plants, the club mosses, although in the Carboniferous they included large trees which dominated the coal-swamp vegetation...

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Permian

Overview page. Subjects: Biological Sciences.

The latest period of Palaeozoic time, stretching approximately from 290 to 248 million years bp.

http://www.ucmp.berkeley.edu/permian/permian.html An overview of the Permian period.

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prothallus

Overview page. Subjects: Biological Sciences.

A small flattened multicellular structure that represents the independent gametophyte generation of clubmosses, horsetails, and ferns. In some of these plants a single prothallus bears both...

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Psilotaceae

Overview page. Subjects: Plant Sciences and Forestry.

(order Psilotales)

A family of very ancient and primitive vascular cryptogams (Pteridophyta), characterized by forked stems bearing small, scale-like appendages (Psilotum), or...

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Pteropsida

Overview page. Subjects: Earth Sciences and Geography.

In older classifications, a subdivision of tracheophytes that contained the ferns and seed plants, or a class of the Pteridophyta containing only the ferns.

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Selaginellaceae

Overview page. Subjects: Plant Sciences and Forestry.

A family of the Pteridophyta in the wide sense, or of the Lycopsida in the narrower sense, of plants similar to the clubmosses (Lycopodiaceae), but showing heterospory, with megasporangia,...

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Sphenopsida

Overview page. Subjects: Earth Sciences and Geography.

A subdivision of the Pteridophyta, represented today by 1 genus only, Equisetum. Sphenopsids flourished in the Carboniferous coal swamps and one of the fossil types of this period,...

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spore

Overview page. Subjects: Biological Sciences.

A reproductive cell that can develop into an individual without first fusing with another reproductive cell (compare gamete). Spores are produced by plants, fungi, bacteria, and some...

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sporophyll

Overview page. Subjects: Plant Sciences and Forestry.

A leaf in the Pteridophyta that bears sporangia. The term is most often applied to the small, scale-like leaves in the cones of Lycopodium and Selaginella, which bear sporangia on their...

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tracheophyte

Overview page. Subjects: Plant Sciences and Forestry — Earth Sciences and Geography.

Any plant that has elaborate tissues, including vascular tissue; a conspicuous sporophyte generation; and complex leaves with waterproof cuticles. Tracheophytes include plants of the phyla...

See overview in Oxford Index