microspores

Meiosis in the male side give rise to four haploid spores, termed microspores.

Nobel Lecture The Significance of Responses of the Genome to Challenge 1983

Like the microspores of the smaller club mosses, a small cell is cut off from the body of the spore

Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell

The pollen cells are formed from mother cells by a process of cell division and subsequent setting free of the daughter cells or pollen cells by rejuvenescence, which is distinctly comparable with that of the formation of the microspores of Lycopodiaceæ, etc. The subsequent behavior of the pollen cell, its division and its fertilization of the germinal vesicle or oosphere, leave no doubt as to its analogy with the microspore of vascular cryptogams.

Scientific American Supplement, No. 531, March 6, 1886 Various

Cordaites, leaves, ferns, microspores, macrospores, pollen grains, rootlets, etc., exactly as would have done a gelatinous mass that upon coagulating in a liquid had carried along with it all the solid bodies that had accidentally fallen into it and that were in suspension.

Scientific American Supplement, No. 481, March 21, 1885 Various

Thus in the Rhizocarpæ there are two kinds of spores, _microspores_ and

Scientific American Supplement, No. 531, March 6, 1886 Various

In the higher spermaphytes the spore-bearing leaves (sporophylls) become much modified, and receive special names, those bearing the microspores being commonly known as stamens; those bearing the macrospores, carpels or carpophylls.

Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell

In the Scotch pine the microspores are ripe about the end of May.

Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell

D, Gemiasma rubra; mature plant filled with microspores.

Scientific American Supplement, No. 384, May 12, 1883 Various

The microspores (pollen spores) are formed in groups of four in precisely the same way as the spores of the bryophytes and pteridophytes, and by collecting the male flowers as they begin to appear in the spring, and crushing the sporangia in water, the process of division may be seen.

Elements of Structural and Systematic Botany For High Schools and Elementary College Courses Douglas Houghton Campbell

These, as in Gymnosperms, are of two kinds, microspores or pollen-grains, borne in the stamens (or microsporophylls) and megaspores, in which the egg-cell is developed, contained in the ovule, which is borne enclosed in the carpel (or megasporophyll).

Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1 Various