Calyptra

Also called cap. a hood or hoodlike part, as the lid of the capsule in mosses.
a root cap.
Historical Examples

An Elementary Text-book of the Microscope John William Griffith
An Elementary Text-book of the Microscope John William Griffith
The Manual of the Botany of the Northern United States Asa Gray
Lachesis Lapponica Carl von Linn
The Manual of the Botany of the Northern United States Asa Gray
The Elements of Botany Asa Gray
Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 3 Various
Chambers’s Twentieth Century Dictionary (part 1 of 4: A-D) Various
The Manual of the Botany of the Northern United States Asa Gray
An Elementary Text-book of the Microscope John William Griffith

noun (botany)
a membranous hood covering the spore-bearing capsule of mosses and liverworts
any hoodlike structure, such as a root cap
calyptra
(kə-lĭp’trə)

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