EXOSTOME Meaning and
Definition
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Exostome is a term used in biology to refer to a type of protective covering or structure found in certain plant species. More specifically, it is a specialized outer layer that surrounds and protects the spore-bearing part of a fungus, known as the sporangium or capsule. This structure is typically found in mosses, liverworts, and certain ferns.
The exostome is usually composed of a series of layered cells that form a complex shape. It is commonly fused to the mouth of the sporangium and functions to regulate the release of spores. The exostome may have various features that aid in spore dispersal, such as teeth or appendages that aid in wind dispersal or attachment to other surfaces. In some species, the exostome may also play a role in moisture retention or absorption, helping to create a suitable environment for spore germination.
The term "exostome" is derived from the Greek words "exo," meaning outside, and "stoma," meaning mouth. It is used to differentiate this outer covering from the inner layer of the sporangium, called the endostome. Together, the exostome and endostome form the peristome, which is the complete ring of structures surrounding the sporangium.
Overall, exostomes are important adaptations in certain plants, helping to protect and disperse their reproductive structures, ultimately aiding in the survival and propagation of these species.
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In bot., the outer opening of the foramen of the ovule.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
Common Misspellings for EXOSTOME
- wxostome
- sxostome
- dxostome
- rxostome
- 4xostome
- 3xostome
- ezostome
- ecostome
- esostome
- exkstome
- exlstome
- expstome
- ex0stome
- ex9stome
- exoatome
- exoztome
- exoxtome
- exodtome
- exoetome
Similar spelling words for EXOSTOME
- ecosystem,
- ecosystem-based,
- access time,
- ecosystem-level,
- whole-ecosystem,
- Exostoma,
- Exostemma.
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