mesosporen.

Brit.

/ˈmɛsə(ʊ)spɔː/, U.S.

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

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

Etymology: < meso- comb. form + spore n. Compare mesosporium n.

1. Botany and Mycology. The middle layer of the wall of any of several types of three-layered spores (e.g. the megaspore of a clubmoss or the zygospore of a zygnemaceous alga).

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. 311 Mesosporium, Mesospore.

1890 Cent. Dict. Mesospore, the middle coat or layer of a spore when it is possible to distinguish three layers, as in the spores of Onoclea Struthiopteris.

1901 Bot. Gaz. 31 214 Between the exospore and the protoplasm of the cell (now called megaspore) developing from the latter, appears the mesospore.

1948 Amer. Jrnl. Bot. 35 424/1 Crushing of the oospores has revealed what appear to be three distinct layers, the epispore relatively thin and colorless, the mesospore thick, granulate, and golden-brown, and the endospore very thin and colorless.

1999 Plant Systematics & Evol. 217 221 A gap in the exospore and the presence of a mesospore is found to be a normal part of development in the ten species of Selaginella we have studied.

2. Mycology. A one-celled teleutospore occurring in species of rust fungus which normally produce two-celled teleutospores.

ΚΠ

1889 Bot. Gaz. 14 140 I take it that these spores are simply dwarfed forms... According to this view of formation the term ‘mesospore’ used either according to Sorauer or Dietel is not applicable to these anomalies as found in the species studied.

1893 Bot. Gaz. 18 456 In this case, not a single two-celled spore germinated while the mesospores germinated profusely.

1927 H. C. I. Gwynne-Vaughan & B. Barnes Struct. & Devel. Fungi (ed. 2) 263 One-celled teleutospores occurring exceptionally in two-celled species are known as mesospores.

1971 P. H. B. Talbot Princ. Fungal Taxon. xii. 218 Mesospores are one-celled teleutospores occurring in species which normally have two-celled teleutospores, as in P[uccinia] graminis.

1990 Systematic Bot. 15 572/1 Mesospores as well as 3-celled teleutospores are not uncommon.

Derivatives

mesoˈsporial adj.

ΚΠ

1994 Canad. Jrnl. Bot. 72 1550 In C[eriosporopsis] circumvestita, the sheath is mesosporial in origin and is chambered.

1996 Mycoscience 37 129 Ascospores are bi-celled and ridged. The ridges are outgrowths of the outer mesosporial layer and formed later in ascosporogenesis.

mesoˈsporic adj. rare

ΚΠ

1890 Cent. Dict. Mesosporic.

1918 Amer. Jrnl. Bot. 5 471 Most of the teliospores in the collection number 561 are mesosporic.

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

单词	mesospore
释义	mesosporen. Brit. /ˈmɛsə(ʊ)spɔː/, U.S. /ˈmɛzəˌspɔr/; see also meso- comb. form. Origin: Formed within English, by compounding. Etymons: meso- comb. form, spore n. Etymology: < meso- comb. form + spore n. Compare mesosporium n. 1. Botany and Mycology. The middle layer of the wall of any of several types of three-layered spores (e.g. the megaspore of a clubmoss or the zygospore of a zygnemaceous alga). 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. 311 Mesosporium, Mesospore. 1890 Cent. Dict. Mesospore, the middle coat or layer of a spore when it is possible to distinguish three layers, as in the spores of Onoclea Struthiopteris. 1901 Bot. Gaz. 31 214 Between the exospore and the protoplasm of the cell (now called megaspore) developing from the latter, appears the mesospore. 1948 Amer. Jrnl. Bot. 35 424/1 Crushing of the oospores has revealed what appear to be three distinct layers, the epispore relatively thin and colorless, the mesospore thick, granulate, and golden-brown, and the endospore very thin and colorless. 1999 Plant Systematics & Evol. 217 221 A gap in the exospore and the presence of a mesospore is found to be a normal part of development in the ten species of Selaginella we have studied. 2. Mycology. A one-celled teleutospore occurring in species of rust fungus which normally produce two-celled teleutospores. ΚΠ 1889 Bot. Gaz. 14 140 I take it that these spores are simply dwarfed forms... According to this view of formation the term ‘mesospore’ used either according to Sorauer or Dietel is not applicable to these anomalies as found in the species studied. 1893 Bot. Gaz. 18 456 In this case, not a single two-celled spore germinated while the mesospores germinated profusely. 1927 H. C. I. Gwynne-Vaughan & B. Barnes Struct. & Devel. Fungi (ed. 2) 263 One-celled teleutospores occurring exceptionally in two-celled species are known as mesospores. 1971 P. H. B. Talbot Princ. Fungal Taxon. xii. 218 Mesospores are one-celled teleutospores occurring in species which normally have two-celled teleutospores, as in P[uccinia] graminis. 1990 Systematic Bot. 15 572/1 Mesospores as well as 3-celled teleutospores are not uncommon. Derivatives mesoˈsporial adj. ΚΠ 1994 Canad. Jrnl. Bot. 72 1550 In C[eriosporopsis] circumvestita, the sheath is mesosporial in origin and is chambered. 1996 Mycoscience 37 129 Ascospores are bi-celled and ridged. The ridges are outgrowths of the outer mesosporial layer and formed later in ascosporogenesis. mesoˈsporic adj. rare ΚΠ 1890 Cent. Dict. Mesosporic. 1918 Amer. Jrnl. Bot. 5 471 Most of the teliospores in the collection number 561 are mesosporic. This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2022). < n.1882
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