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91homospory — /heuh mos peuh ree, hoh /, n. the production of a single kind of spore, neither microspore nor megaspore. [1900 05; HOMO + SPORE + Y3] * * * …
92megaspore — megasporic /meg euh spawr ik, spor /, adj. /meg euh spawr , spohr /, n. Bot. 1. the larger of the two kinds of spores characteristically produced by seed plants and a few fern allies, developing into a female gametophyte. Cf. microspore. 2. the… …
93microsporocyte — /muy kreuh spawr euh suyt , spohr /, n. Bot. one of the mother cells that produce four microspores by meiosis. [1935 40; MICROSPORE + O + CYTE] * * * …
94cycadophyte — ▪ plant Introduction any member of a diverse collection of mostly extinct primitive gymnospermous plants. They probably had their origins among the progymnosperms of the Devonian Period (416 to 359 million years ago), possibly among a… …
95lower vascular plant — ▪ biology Introduction formerly pteridophyte, also called vascular cryptogam, any of the spore bearing vascular plants, including the ferns, club mosses, spike mosses, quillworts, horsetails, and whisk ferns. Once considered of the… …
96lycophyte — ▪ plant division Introduction (division Lycopodiophyta or Lycophyta), any spore bearing vascular plant that is one of the club mosses (club moss) and their allies, living and fossil. Present day lycophytes are grouped in 6 genera (some… …
97Magnoliidae — ▪ plant subclass Introduction subclass of woody or herbaceous flowering plants belonging to the class Magnoliopsida. Members of the Magnoliidae are dicotyledonous plants that retain some primitive anatomic and morphological… …
98mosquito fern — ▪ fern genus any of six species in the fern family Salviniaceae of the division Pteridophyta (the lower vascular plants (plant)). This family contains only one other genus, Salvinia (10–12 species). Members of Azolla are distributed nearly… …
99plant development — Introduction a multiphasic process in which two distinct forms succeed each other in alternating generations. One form, created by the union of sexual cells (gametes (gamete)), contains two sets of similar chromosomes (diploid). At sexual… …
100reproductive system, plant — Introduction any of the systems, sexual or asexual, by which plants reproduce. In plants, as in animals, the end result of reproduction is the continuation of a given species, and the ability to reproduce is, therefore, rather conservative …
