mesosporiumn.

Brit.

/ˌmɛsə(ʊ)ˈspɔːrɪəm/, U.S.

/ˌmɛzoʊˈspɔriəm/; see also meso- comb. form.

Origin: Formed within English, by compounding. Etymons: meso- comb. form, English archesporium.

Etymology: < meso- comb. form + -sporium (in e.g. archesporium: see archespore n.). Compare mesospore n.

Botany and Mycology.

The middle layer of the wall of any of several types of three-layered spores, esp. of the ascospore of a fungus. Cf. mesospore n.

ΘΚΠ

the world > plants > part of plant > reproductive part(s) > spore or sporule > [noun] > parts of or related to > other parts of

endospore1875

mesospore1882

mesosporium1882

sporoplasm1893

1882–4 M. C. Cooke Brit. Fresh-water Algæ I. 109 The cell-contents surround themselves with a new layer of cellulose (mesosporium) within the original one (exosporium).

1955 G. M. Smith Cryptogamic Bot. (ed. 2) II. iii. 36 The median layer (mesosporium) [sc. in Riccia curtisii, a liverwort] is thick and composed of three concentric zones.

1993 Philos. Trans. (Royal Soc.) B. 339 483 Ascospore walls comprise a bipartite mesosporium, a thinner electron-opaque episporium and an outer mucilaginous sheath.

1999 Mycologia 91 326 Ascospores are verrucose, with projections arising from the outer mesosporium and surrounded by the episporium.

This is a new entry (OED Third Edition, September 2001; most recently modified version published online March 2022).

单词	mesosporium
释义	mesosporiumn. Brit. /ˌmɛsə(ʊ)ˈspɔːrɪəm/, U.S. /ˌmɛzoʊˈspɔriəm/; see also meso- comb. form. Origin: Formed within English, by compounding. Etymons: meso- comb. form, English archesporium. Etymology: < meso- comb. form + -sporium (in e.g. archesporium: see archespore n.). Compare mesospore n. Botany and Mycology. The middle layer of the wall of any of several types of three-layered spores, esp. of the ascospore of a fungus. Cf. mesospore n. ΘΚΠ the world > plants > part of plant > reproductive part(s) > spore or sporule > [noun] > parts of or related to > other parts of endospore1875 mesospore1882 mesosporium1882 sporoplasm1893 1882–4 M. C. Cooke Brit. Fresh-water Algæ I. 109 The cell-contents surround themselves with a new layer of cellulose (mesosporium) within the original one (exosporium). 1955 G. M. Smith Cryptogamic Bot. (ed. 2) II. iii. 36 The median layer (mesosporium) [sc. in Riccia curtisii, a liverwort] is thick and composed of three concentric zones. 1993 Philos. Trans. (Royal Soc.) B. 339 483 Ascospore walls comprise a bipartite mesosporium, a thinner electron-opaque episporium and an outer mucilaginous sheath. 1999 Mycologia 91 326 Ascospores are verrucose, with projections arising from the outer mesosporium and surrounded by the episporium. This is a new entry (OED Third Edition, September 2001; most recently modified version published online March 2022). < n.1882
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