megaspore

meg·a·spore

M0200100 (mĕg′ə-spôr′)n. A spore that gives rise to a female gametophyte and is larger than a microspore.

meg′a·spor′ic adj.

megaspore

(ˈmɛɡəˌspɔː) n1. (Botany) Also called: macrospore the larger of the two types of spore produced by some spore-bearing plants, which develops into the female gametophyte. Compare microspore¹2. (Botany) the cell in flowering plants that gives rise to the embryo sac ˌmegaˈsporic adj

meg•a•spore

(ˈmɛg əˌspɔr, -ˌspoʊr)

n. the larger of the two kinds of spores characteristically produced by seed plants and a few fern allies, developing into a female gametophyte. Compare microspore. [1885–90] meg`a•spor′ic (-ˈspɔr ɪk, -ˈspɒr-) adj.

Thesaurus

Noun

megaspore - larger of the two types of spore produced in heterosporous plants; develops in ovule into a female gametophytemacrosporespore - a small usually single-celled asexual reproductive body produced by many nonflowering plants and fungi and some bacteria and protozoans and that are capable of developing into a new individual without sexual fusion; "a sexual spore is formed after the fusion of gametes"

Megaspore

megaspore

[′meg·ə‚spȯr] (botany) macrospore

Megaspore

a spore from which develops the female prothallium (in gymnosperms, the primary endosperm nucleus; in angiosperms, the embryo sac). The megaspore arises as a result of the division of the megasporocyte (mother cell). In Pteridophyta the number of mature megaspores in the megasporangium varies. The Isoetes have many megaspores. The Lepidodendron and Sigillaria have eight to 16; the Selaginella, two to four; the water ferns, only one. Megaspores grow into female prothallia either inside (Lepidodendron, Selaginella, Salvinia) or outside (Marsilea, some Selaginella) the megasporangium. The first stages in the development of the prothallium occur inside the megaspore; the membranes of the megaspore then open and the parts of the prothallium that bear the archegonia emerge (in Salvinia they turn green). In seed plants, four megaspores usually form in each nucellus (the central part of the ovule).

megaspore

mac·ro·spore

(mak'rō-spōr), The larger of two spore types of certain protozoans or fungi. Synonym(s): megalospore, megaspore [macro- + G. sporos, seed]

megaspore

macrospore

the larger of two types of SPORES produced by many ferns and seed plants. The megaspore gives rise to a female GAMETOPHYTE in ferns and in seed plants, and in flowering plants becomes the EMBRYO SAC. Compare MICROSPORE.

megaspore

meg·a·spore

megaspore

meg•a•spore

Megaspore

megaspore

Megaspore

megaspore

mac·ro·spore

megaspore

macrospore

megaspore

Synonyms for megaspore

noun larger of the two types of spore produced in heterosporous plants

Synonyms

Related Words