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In botany, an operculum (pl.: opercula) or calyptra (from Ancient Greek καλύπτρα (kalúptra) 'veil') is a cap-like structure in some flowering plants, mosses, and fungi. It is a covering, hood or lid, describing a feature in plant morphology .
This articulation of the teeth is termed arthrodontous and is found in the moss subclass Bryopsida. In other groups of mosses, the capsule is either nematodontous with an attached operculum (as in the Polytrichopsida), or else splits open without operculum or teeth. There are two subtypes of arthrodontous peristome. [1]
The moss Physcomitrium patens has been used as a model organism to study how plants repair damage to their DNA, especially the repair mechanism known as homologous recombination. If the plant cannot repair DNA damage, e.g., double-strand breaks, in their somatic cells, the cells can lose normal functions or
The operculum is long-rostrate, which means it has an apical beak narrowing to a slender tip. [2] [3] [4] Cyathophorum bulbosum is dioicous, meaning that male and females are separate ‘plants’.The life cycle is dominated by the gametophyte stage. There are no other moss species within Australia that look similar.
It is a dioicous moss, having antheridia and archegonia on different gametophores. Once the archegonia is fertilized the sporophyte generation begins to form. It develops to have a seta six to 14 mm long, and have a capsule two to three mm long, with a one mm operculum. The fully developed capsule will have four peristome teeth attached to the ...
Climacium dendroides, also known as tree climacium moss, [1] [2] belongs in the order Hypnales [3] and family Climaciaceae, [4] in class Bryopsida and subclass Bryidae.It is identified as a "tree moss" due to its distinctive morphological features, and has four species identified across the Northern Hemisphere.
The moss produces short, cylindrical and slightly curved capsules which contain the spores. The capsules are 1.7-2.4 mm long and have a lid-like operculum measuring 0.6-0.9 mm. They are borne on reddish-brown stalks which are 1-2.5 cm long. The moss is dioicous, having separate male and female plants.
Operculum (lid) "Finger" that turns inside out / / / Barbs Venom Victim's skin Victim's tissues. An operculum is an anatomical feature, a stiff structure resembling a lid or a small door that opens and closes, and thus controls contact between the outside world and an internal part of an animal. Examples include: