Definify.com
Webster 1913 Edition
Calyptra
Ca-lyp′tra
(kȧ-lĭp′trȧ)
, Noun.
[NL., fr. Gr.
καλύπτρα
a covering for the head, fr. καλύπτειν
to cover.] (Bot.)
A little hood or veil, resembling an extinguisher in form and position, covering each of the small flasklike capsules which contain the spores of mosses; also, any similar covering body.
Definition 2024
calyptra
calyptra
English
![](http://llc12.www.definify.com/images_main/Tortula_muralis_kalyptra.jpeg)
Ripening moss sporophyte shedding its calyptra
![](http://llc12.www.definify.com/images_main/Flowering_of_a_single_Ugni_blanc_grape_bud_with_calyptra_shedding_in_Cognac.jpg)
Bud of a flower of a grape shedding its calyptra
![](http://llc12.www.definify.com/images_main/Eucalyptus_ficifolia_dehiscent_flower_bud.jpg)
Calyptrae splitting off the opening buds of Eucalyptus ficifolia
![](http://llc12.www.definify.com/images_main/Fly_haltere_and_calyptra.jpg)
Calyptra(1) over a fly's haltere(3)
Noun
calyptra (plural calyptras or calyptrae)
- (botany) In bryophytes, a thin, hood of tissue that forms from the archegonium and covers the developing sporophyte and is shed as it ripens.[1]
- 1992, Rudolf M. Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, page 4
- (b) sporophyte with foot reduced, the entire sporophyte enveloped by the calyptra, which is ± stipitate at the base.
- 1992, Rudolf M. Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, page 4
- (botany) any cap-like covering of a flower or fruit, such as the operculum over the unopened buds of Eucalyptus flowers[1]
- (botany) Any of various coverings at the tips of structures, in the terminology of various authors; for example rootcaps and the apical cells of trichomes.[1]
- (entomology) In flies such as the housefly, Musca, in the taxonomic order Diptera, zoological section Schizophora, subsection Calyptrata, the calyptra is a membranous rearward extension of the forewing; it covers the haltere.[2]
Translations
thin, hood-like tissue