perichaetiumperichetiumn.

Brit.

/ˌpɛrɪˈkiːtɪəm/, U.S.

/ˌpɛrəˈkidiəm/

Inflections: Plural perichaetia;

Forms: 1700s– perichaetium, 1800s– perichetium (chiefly U.S.).

Origin: A borrowing from Latin. Etymon: Latin perichaetium.

Etymology: < scientific Latin perichaetium (Linnaeus Genera Plantarum (ed. 5, 1754) 487) < ancient Greek περι- peri- prefix + χαίτη long hair, as of a mane, leaves, foliage, in modern use taken also in sense ‘bristle’ (see chaeta n.) + scientific Latin -ium (see -y suffix⁴).On the analogy of perianthium n. and pericarpium n.², etc., the present word might be expected to mean ‘that which surrounds or encircles the hair or foliage’, but is instead employed to express the hair or foliage that surrounds.

Botany.

A cluster of modified leaves surrounding the archegonium of a moss. Also: the perianth of a foliose liverwort (rare).

ΘΚΠ

the world > plants > part of plant > reproductive part(s) > flower or part containing reproductive organs > inflorescence or collective flower > [noun] > of particular type, shape, or arrangement > spadix

pestle1578

pistil1717

spadix1760

perichaetium1777

1777 J. Lightfoot Flora Scotica II. 737 Haller ranks this moss [Bryum cæspiticium] among the Hypnums, on account of the vagina or perichætium at the base of the filament.

1796 W. Withering Arrangem. Brit. Plants (ed. 3) I. 364 The female flowers [of Jungermannia asplenioides] are on a distinct plant, included also in a leafy calyx or perichætium, at the top of the plant.

1814 J. E. Smith Introd. Bot. (ed. 3) 92 The part called calyptra being removed from the list, as being a corolla, the perichætium takes its place among the seven kinds of calyx.

1863 M. J. Berkeley Handbk. Brit. Mosses Gloss. 312 Perichætium, the leaves immediately surrounding the base of the fruit stalk.

1882 S. H. Vines tr. J. von Sachs Text-bk. Bot. (ed. 2) 343 In the foliose Jungermannieæ and in Mosses several archegonia are commonly surrounded by an investment formed of leaves which is termed the Perichætium.

1927 Bot. Gaz. 84 89 Certain perichaetia were noted which..stood midway between male and female perichaetia.

1969 F. E. Round Introd. Lower Plants viii. 107 Nearer the apex the leaves are progressively modified—the altered..lateral leaves being termed bracts and the altered underleaves bracteoles; collectively these form the perichaetium.

1992 M. Ingrouille Diversity & Evol. Land Plants 106 In leafy liverworts the sex organs are either lateral..or the archegonia are apical, with a kind of perichaetium, called the perianth surrounding them.

This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).

单词	perichaetium
释义	perichaetiumperichetiumn. Brit. /ˌpɛrɪˈkiːtɪəm/, U.S. /ˌpɛrəˈkidiəm/ Inflections: Plural perichaetia; Forms: 1700s– perichaetium, 1800s– perichetium (chiefly U.S.). Origin: A borrowing from Latin. Etymon: Latin perichaetium. Etymology: < scientific Latin perichaetium (Linnaeus Genera Plantarum (ed. 5, 1754) 487) < ancient Greek περι- peri- prefix + χαίτη long hair, as of a mane, leaves, foliage, in modern use taken also in sense ‘bristle’ (see chaeta n.) + scientific Latin -ium (see -y suffix⁴).On the analogy of perianthium n. and pericarpium n.², etc., the present word might be expected to mean ‘that which surrounds or encircles the hair or foliage’, but is instead employed to express the hair or foliage that surrounds. Botany. A cluster of modified leaves surrounding the archegonium of a moss. Also: the perianth of a foliose liverwort (rare). ΘΚΠ the world > plants > part of plant > reproductive part(s) > flower or part containing reproductive organs > inflorescence or collective flower > [noun] > of particular type, shape, or arrangement > spadix pestle1578 pistil1717 spadix1760 perichaetium1777 1777 J. Lightfoot Flora Scotica II. 737 Haller ranks this moss [Bryum cæspiticium] among the Hypnums, on account of the vagina or perichætium at the base of the filament. 1796 W. Withering Arrangem. Brit. Plants (ed. 3) I. 364 The female flowers [of Jungermannia asplenioides] are on a distinct plant, included also in a leafy calyx or perichætium, at the top of the plant. 1814 J. E. Smith Introd. Bot. (ed. 3) 92 The part called calyptra being removed from the list, as being a corolla, the perichætium takes its place among the seven kinds of calyx. 1863 M. J. Berkeley Handbk. Brit. Mosses Gloss. 312 Perichætium, the leaves immediately surrounding the base of the fruit stalk. 1882 S. H. Vines tr. J. von Sachs Text-bk. Bot. (ed. 2) 343 In the foliose Jungermannieæ and in Mosses several archegonia are commonly surrounded by an investment formed of leaves which is termed the Perichætium. 1927 Bot. Gaz. 84 89 Certain perichaetia were noted which..stood midway between male and female perichaetia. 1969 F. E. Round Introd. Lower Plants viii. 107 Nearer the apex the leaves are progressively modified—the altered..lateral leaves being termed bracts and the altered underleaves bracteoles; collectively these form the perichaetium. 1992 M. Ingrouille Diversity & Evol. Land Plants 106 In leafy liverworts the sex organs are either lateral..or the archegonia are apical, with a kind of perichaetium, called the perianth surrounding them. This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022). < n.1777
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