mesotheciumn.

Brit.

/ˌmɛsə(ʊ)ˈθiːsɪəm/, U.S.

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

Origin: Formed within English, by compounding. Etymons: meso- comb. form, endothecium n. at endo- prefix and comb. form , exothecium n. at exo- prefix

Etymology: < meso- comb. form + -thecium (in e.g. endothecium n. at endo- prefix and comb. form , exothecium n. at exo- prefix ). In sense ‘the thecium of a lichen’ after e.g. apothecium n. Compare French mesothecium ( A. Chatin De l'anthère (1870) 33).

Botany. Now rare.

A layer in the outer wall of the pollen sac of a young anther, between the endothecium and the tapetum. Also: the thecium of a lichen (rare).

ΚΠ

1870 A. Henfrey & M. T. Masters Elem. Course Bot. (ed. 2) iii. i. 530 Succeeding the endothecium are one or more layers of permanent cells, some of which contain spiral fibres. These cells constitute the mesothecium.

1885 Cassell's Encycl. Dict. IV. ii Mesothecium, according to Schleiden, an inner coat in a young anther. It becomes the second coat in an adult one.

1900 B. D. Jackson Gloss. Bot. Terms Mesothecium, the Thecium of Lichens.

1980 Grana 19 109/1 A tapetum adjacent cell, a remnant of the mesothecium is located on the abaxial side of the tapetum.

This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2022).

单词	mesothecium
释义	mesotheciumn. Brit. /ˌmɛsə(ʊ)ˈθiːsɪəm/, U.S. /ˌmɛzoʊˈθisiəm/; see also meso- comb. form. Origin: Formed within English, by compounding. Etymons: meso- comb. form, endothecium n. at endo- prefix and comb. form , exothecium n. at exo- prefix Etymology: < meso- comb. form + -thecium (in e.g. endothecium n. at endo- prefix and comb. form , exothecium n. at exo- prefix ). In sense ‘the thecium of a lichen’ after e.g. apothecium n. Compare French mesothecium ( A. Chatin De l'anthère (1870) 33). Botany. Now rare. A layer in the outer wall of the pollen sac of a young anther, between the endothecium and the tapetum. Also: the thecium of a lichen (rare). ΚΠ 1870 A. Henfrey & M. T. Masters Elem. Course Bot. (ed. 2) iii. i. 530 Succeeding the endothecium are one or more layers of permanent cells, some of which contain spiral fibres. These cells constitute the mesothecium. 1885 Cassell's Encycl. Dict. IV. ii Mesothecium, according to Schleiden, an inner coat in a young anther. It becomes the second coat in an adult one. 1900 B. D. Jackson Gloss. Bot. Terms Mesothecium, the Thecium of Lichens. 1980 Grana 19 109/1 A tapetum adjacent cell, a remnant of the mesothecium is located on the abaxial side of the tapetum. This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2022). < n.1870
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