macrosporangiumn.
/ˌmakrəʊspəˈran(d)ʒɪəm/, U.S. /ˌmækroʊspəˈrændʒiəm/, /ˌmækroʊspoʊˈrændʒiəm/ Botany.
= megasporangium n.
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the world > plants > particular plants > moss > [noun] > club-moss or moss-like ferns > parts of
powder1672
oophoridium1847
oophorid1848
oosporangium1857
macrosporangium1862
rhizophore1875
megasporangium1886
megasporange1889
protophyll1891
prophyll1971
1862 F. Currey tr. W. Hofmeister On Germination Higher Cryptogamia xiv. 387 The subsequent development exhibits essential differences, according as the sporangia are destined to become microsporangia or macrosporangia, i.e. to produce small or large spores.
1875 A. W. Bennett & W. T. T. Dyer tr. J. von Sachs Text-bk. Bot. 396 If a microsporangium is about to be formed, each of the mother-cells is broken up into four tetrahedral spores, which all develope into microspores; in the macrosporangium, on the contrary, the mother-cells remain, with one exception, undivided.
1888 Encycl. Brit. XXIV. 130/2 In the macrosporangium there are generally but few sporogenous cells.
1911 Science 13 Oct. 470/2 Chodat brings forward some strong reasons for his conclusions that the Lyginodendreæ were..provided with two kinds of sporangin, microsporangia similar to those of Leptosporangiate ferns, [etc.].
1952 Bot. Gaz. 113 267/1 A rather fantastic proposal is that of Hagerup, who considered the ovules of Corylus monosporangiate macrosporangia.
1995 Phycol. Res. 43 185/1 Macrosporangia containing a single large motile spore were formed under long and short day conditions below 20° C.
This is a new entry (OED Third Edition, March 2000; most recently modified version published online March 2022).
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n.1862