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Diagram showing the alternation of generations between a diploid sporophyte (bottom) and a haploid gametophyte (top) A sporophyte (/ ˈ s p ɔːr. ə ˌ f aɪ t /) is the diploid multicellular stage in the life cycle of a plant or alga which produces asexual spores. This stage alternates with a multicellular haploid gametophyte phase.
A sporangium (from Late Latin, from Ancient Greek σπορά (sporá) 'seed' and ἀγγεῖον (angeîon) 'vessel'); pl.: sporangia) [1] is an enclosure in which spores are formed. [2] It can be composed of a single cell or can be multicellular. Virtually all plants, fungi, and many other groups form sporangia at some point in their life cycle.
In all bryophytes, the primary plants are the haploid gametophytes, with the only diploid portion being the attached sporophyte, consisting of a stalk and sporangium. Because these plants lack lignified water-conducting tissues, they cannot become as tall as most vascular plants. Algae, especially green algae. The algae consist of several ...
The result is a multi-cellular diploid organism, called the sporophyte (because at maturity it produces spores). [17] When it reaches maturity, the sporophyte produces one or more sporangia (singular: sporangium) which are the organs that produce diploid
Fertilized eggs become zygotes, which develop into sporophyte embryos inside the archegonia. Mature sporophytes remain attached to the gametophyte. They consist of a stalk called a seta and a single sporangium or capsule. Inside the sporangium, haploid spores are produced by meiosis. These are dispersed, most commonly by wind, and if they land ...
Calyptra – an enlarged archegonial venter that protects the capsule containing the embryonic sporophyte. Capsule – generally synonymous with the sporangium, it specifically refers to the structure which contains the spores. Sometimes referred to as an "urn" Cleistocarpous – having a capsule which lacks an operculum, often closed.
The defining feature of the clade is that the sporophyte branches and bears multiple sporangia. This distinguishes polysporangiophytes from liverworts , mosses and hornworts , which have unbranched sporophytes each with a single sporangium.
The sporophyll of a fern. It is a fertile leaf bearing reproductive structures. A sporophyll is a leaf that bears sporangia.Both microphylls and megaphylls can be sporophylls.