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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 .
Polytrichastrum formosum, commonly known as the bank haircap moss, [2] is a species of moss belonging to the family Polytrichaceae. It has a cosmopolitan distribution , found mostly in temperate latitudes in the Northern Hemisphere [ 3 ] and especially dominant in Europe and North America.
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 main function of the epiphragm is to reduce water loss through the aperture during inactivity. [1] An operculum is a somewhat similar but permanent anatomical feature that is found in other clades of gastropods. The operculum serves some of the same functions as an epiphragm. Sometimes it protects the snail against predation.
Polytrichum strictum, commonly known as bog haircap moss [1] or strict haircap, [2] is an evergreen and perennial species of moss native to Sphagnum bogs and other moist habitats in temperate climates. It has a circumboreal distribution, and is also found in South America and Antarctica. [3]
Polytrichum is a genus of mosses — commonly called haircap moss or hair moss — which contains approximately 70 species that have a cosmopolitan distribution. The genus Polytrichum has a number of closely related sporophytic characters. The scientific name is derived from the Ancient Greek words polys, meaning "many", and thrix, meaning "hair".
Hippomanes first appears in pregnant horses and zebras ca. 85 days from conception, earlier there being small white flecks of tissue debris instead. [1] The changes in hippomanes color correspond to changes in color of allantoic fluid. [1] They are often surrounded by shed cells.
Grass is a natural source of nutrition for a horse. Equine nutrition is the feeding of horses, ponies, mules, donkeys, and other equines. Correct and balanced nutrition is a critical component of proper horse care. Horses are non-ruminant herbivores of a type known as a "hindgut fermenter." Horses have only one stomach, as do humans.
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