NOUN
- larger of the two types of spore produced in heterosporous plants; develops in ovule into a female gametophyte
How To Use macrospore In A Sentence
- The macrospore or embryo-sac produces a prothallium called the endosperm, in which archegonia or corpuscula are formed; and lastly, in typical dicotyledons it is only lately that any trace of a prothallium from the microspore or pollen cell has been discovered, while the macrospore or embryo-sac produces only two or three prothallium cells, known as antipodal cells, and two or three oospheres, known as germinal vesicles. Scientific American Supplement, No. 531, March 6, 1886
- The nucellus is a cellular tissue enveloping one large cell, the embryo-sac or macrospore. Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
- At the top of this macrospore or embryo-sac two or three germinal vesicles are formed by free cell formation, and also two or three cells called antipodal cells, since they travel to the other end of the embryo-sac; these latter represent a rudimentary prothallium. Scientific American Supplement, No. 531, March 6, 1886