Calyptra

Calyptra (from καλύπτρα (kalúptra) "veil") is a scientific term used in botany for a covering, hood or lid. It describes a feature in plant morphology.

Calyptra of tortula moss Tortula muralis
Calyptra on top of the brown spore capsule (sporophyte) of the moss Physcomitrella patens. The brownish archegonial venter is still visible.
This article is about the feature in plant morphology. For other uses, see Calyptra (disambiguation).

Bryophytes

In bryophytes, the calyptra (plural calyptrae) is an enlarged archegonial venter that protects the capsule containing the embryonic sporophyte.[1] The calyptra is usually lost before the spores are released from the capsule. The shape of the calyptra can be used for identification purposes.[2]

Flowering plants

In flowering plants, the calyptra is a covering tissue for stamens and carpels. The name is also used for the capping tissue of roots, the root cap.

gollark: I'm not getting any brain interface computer stuff until it has an extremely comprehensive hardware/software test suite. I do not trust computers.
gollark: I could apply, but I don't really have some sort of immediate requirement for a specific React-based app as much as a vague desire to test how well this does at stuff.
gollark: Interesting and, er, somewhat worrying. I would be more interested if I could actually test this myself, and on things more complex than todo lists for which there is not tons of example code on the web anyway.
gollark: https://www.bbc.co.uk/news/uk-53884401The education system really is wonderful!
gollark: Maybe.

References
  1. Ralf Reski (1998): Development, genetics and molecular biology of mosses. In: Botanica Acta. 111, 1-15.
  2. Malcolm; Malcolm, Bill; Nancy (2006), Mosses and other Bryophytes, an Illustrated Glossary, Micro-Optics Press, p. 65, ISBN 0-9582224-7-9
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.