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What is an Indusium in a fern?
The indusium is round, shaped like a tiny umbrella and attached to the leaf from the middle. These sword fern indusia do not quite reach the edge of the sori. Individual sporangia are easily visible around the edge of each sorus.
What is sporangium in fern?
Sporophyte ferns have two methods of asexual reproduction. These form on the undersides of the leaves in spore cases called sporangia. Clusters of sporangia, or sori, appear as brown spots and may or may not be present on all leaves.
What is sporangia in angiosperms?
A sporangium (pl., sporangia) is a plant or fungal structure producing and containing spores. Sporangia occur on angiosperms, gymnosperms, ferns, fern allies, bryophytes, algae, and fungi. Their spores are sometimes called sporangiospores.
What is sporangium in plants?
A sporangium (pl. sporangia) (modern Latin, from Greek σπόρος (sporos), ‘spore’ + ἀγγεῖον (angeion), ‘vessel’) is an enclosure in which spores are formed. It can be composed of a single cell or can be multicellular. All plants, fungi, and many other lineages form sporangia at some point in their life cycle.
How does a fern look like?
Some look like tiny bunches of grapes, some look like a little brown purse, and others like a dome. Often the sporangium starts out light green and as it ripens, turns dark brown. Ferns spores develop into what scientists call “gametophytes”, which usually look flat, green and spongy.
What are types of sporangium?
Sporangia are the specialized spore producing structures found in plants. In Pteridophytes, two types of sporangia are present. The two types of sporangia are (1) Eusporangium and (2) Leptosporangium.
Is a Microsporangium?
Microsporangia are sporangia that produce microspores that give rise to male gametophytes when they germinate. They are diploid microspore mother-cells, which then produce four haploid microspores through the process of meiosis.
Why anther is called Microsporangium?
Due to the presence of two thecae in a lobe, then the anthers of angiosperms are called dithecous. Microsporangia is the structure that is mainly responsible for the production and releases of pollen grains.
What are the three parts of the sporangium?
Sporangia are eusporangiate, homosporous, distinct, vertically dehiscent (plane of dehiscence perpendicular to blade surface), and arranged in a narrow ring or fused into a raised or sunken synangium, which dehisces tangentially into two valves.