Adjacent Words

Pteridophyta definitions

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WordNet (r) 3.0 (2005)

n
1: 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 [syn: Pteridophyta, division Pteridophyta]

Webster's 1913 Dictionary

Pteridophyta Pter`i*doph"y*ta, n. pl. [NL., from Gr. ?, ?, a fern + ? a plant.] (Bot.) A class of flowerless plants, embracing ferns, horsetails, club mosses, quillworts, and other like plants. See the Note under Cryptogamia. -- Pter"i*do*phyte`, n. Note: This is a modern term, devised to replace the older ones acrogens and vascular Cryptogamia.

Webster's 1913 Dictionary

Vascular Vas"cu*lar, a. [L. vasculum a small vessel, dim. of vas vessel: cf. F. vasculaire. See Vase, and cf. Vessel.] 1. (Biol.) (a) Consisting of, or containing, vessels as an essential part of a structure; full of vessels; specifically (Bot.), pertaining to, or containing, special ducts, or tubes, for the circulation of sap. (b) Operating by means of, or made up of an arrangement of, vessels; as, the vascular system in animals, including the arteries, veins, capillaries, lacteals, etc. (c) Of or pertaining to the vessels of animal and vegetable bodies; as, the vascular functions. 2. (Bot.) Of or pertaining to the higher division of plants, that is, the ph[ae]nogamous plants, all of which are vascular, in distinction from the cryptogams, which to a large extent are cellular only. Vascular plants (Bot.), plants composed in part of vascular tissue, as all flowering plants and the higher cryptogamous plants, or those of the class Pteridophyta. Cf. Cellular plants, Cellular. Vascular system (Bot.), the body of associated ducts and woody fiber; the fibrovascular part of plants. Vascular tissue (Bot.), vegetable tissue composed partly of ducts, or sap tubes. Water vascular system (Zo["o]l.), a system of vessels in annelids, nemerteans, and many other invertebrates, containing a circulating fluid analogous to blood, but not of the same composition. In annelids the fluid which they contain is usually red, but in some it is green, in others yellow, or whitish.