calyptra

ca·lyp·tra  (k-lptr)

n.

1. The protective cap or hood covering the spore case of a moss or related plant.

2. A similar hoodlike, lidlike, or caplike structure, such as a root cap.

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[Medieval Latin, from Greek kaluptra, veil, from kaluptein, to cover; see kel-¹ in Indo-European roots.]

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ca·lyptrate (-trt) adj.

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calyptra [kəˈlɪptrə]

n Botany

1. (Life Sciences & Allied Applications / Botany) a membranous hood covering the spore-bearing capsule of mosses and liverworts

2. (Life Sciences & Allied Applications / Botany) any hoodlike structure, such as a root cap

[from New Latin, from Greek kaluptra hood, from kaluptein to cover]

calyptrate  [kəˈlɪpˌtreɪt] adj

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calyptra  (k-lptr)

1. In some bryophyte plants, a structure that covers the young sporophyte as it develops within the tissues of its gametophyte parent. The calyptra, which consists of a thickening of the archegonium walls, eventually breaks open as the spore capsule grows.

2. See root cap.

Thesaurus

Noun

1.

calyptra - the hood or cap covering the calyx of certain plants: e.g., the California poppy plant part, plant structure - any part of a plant or fungus