Definition of Microspore

1. Noun. Smaller of the two types of spore produced in heterosporous plants; develops in the pollen sac into a male gametophyte.

Generic synonyms: Spore

Definition of Microspore

1. n. One of the exceedingly minute spores found in certain flowerless plants, as Selaginella and Isoetes, which bear two kinds of spores, one very much smaller than the other. Cf. Macrospore.

Definition of Microspore

1. Noun. A small spore. ¹

¹ Source:

Definition of Microspore

1. [n -S]

Medical Definition of Microspore

1. A haploid spore produced by a plant sporophyte that develops into a male gametophyte. In seed plants, it corresponds to the developing pollen grain at the uninucleate stage. The smaller of the spores of a heterosporous species. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)

Microspore Pictures

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Lexicographical Neighbors of Microspore

microspora infections
microspore (current term)
microsporidian keratoconjunctivitis

Literary usage of Microspore

Below you will find example usage of this term as found in modern and/or classical literature:

1. Morphology of Angiosperms: (Morphology of Spermatophytes. Part II) by John Merle Coulter, Charles Joseph Chamberlain (1903)
"... the microspore before the appearance of the tube and generative nuclei, and the same cell was noted after the division of the generative nucleus (Fig. ..."

2. The Elementary Principles of General Biology by James Francis Abbott (1914)
"The Germination of the microspore.—Each of the microspores is functional. In germination the nucleus divides, forming two cells, a large one called ..."

3. Bulletin: Mining and Metallurgical Investigations by Carnegie Institute of Technology, Mining Advisory Board (1922)
"It will be called the Middle Kittanning pitted microspore. ... In the Dover area of this bed a second smooth thick-walled microspore is very pronounced and ..."

4. Organography of Plants, Especially of the Archegoniata and Spermaphyta by Karl Goebel, Isaac Bayley Balfour (1905)
"Amongst the Cycadaceae l the germination of the microspore o.' Zamia has been made known to us through the researches of Webber. In the ripe microspore we ..."

5. The American Naturalist by American Society of Naturalists, Essex Institute (1907)
"A figure 1, represents the first mitosis in the microspore, which it will ... formed and lying over against the upper or posterior side of the microspore. ..."

6. Nature and Development of Plants by Carlton Clarence Curtis (1918)
"Male gametophyte of the pine: 6, section of microspore, showing the two air sacs, s, formed by the lifting up of the outer wall of the spore. ..."

7. A Student's Text-book of Botany by Sydney Howard Vines (1896)
"The first indication of its development is the division of the nucleus of the microspore, which may take place even before the microspore escapes from the ..."

8. Botanical Gazette by University of Chicago, JSTOR (Organization) (1903)
"The investigations deal with the two mitotic divisions by which the microspore mother cell gives rise to the four microspores. In practically all anthers of ..."

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