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The Ulvophyceae or ulvophytes are a class of green algae, [3] distinguished mainly on the basis of ultrastructural morphology, life cycle and molecular phylogenetic data. [4] The sea lettuce, Ulva, belongs here. Other well-known members include Caulerpa, Codium, Acetabularia, Cladophora, Trentepohlia and Monostroma.
Dictyotales (from Greek diktyotos 'netlike') [2] is a large order in the brown algae (class Phaeophyceae) containing the single family Dictyotaceae.Members of this order generally prefer warmer (tropical to subtropical) waters than other brown algae, and are prevalent in tropical and subtropical waters thanks to their many chemical defenses to ward off grazers.
Brown algae exist in a wide range of sizes and forms. The smallest members of the group grow as tiny, feathery tufts of threadlike cells no more than a few centimeters (a few inches) long. [6] Some species have a stage in their life cycle that consists of only a few cells, making the entire alga microscopic.
These algae have a relatively simple life cycle and produce only one type of thallus which grows to a maximum size of 2 m. [citation needed] Fertile cavities, the conceptacles, containing the reproductive cells are immersed in the receptacles near the ends of the branches.
Green algae are a group of photosynthetic, eukaryotic organisms that include species with haplobiontic and diplobiontic life cycles. The diplobiontic species, such as Ulva , follow a reproductive cycle called alternation of generations in which two multicellular forms, haploid and diploid, alternate, and these may or may not be isomorphic ...
The entire gametophyte generation, with the sole exception of pollen grains (microgametophytes), is contained within the sporophyte. The life cycle of a dioecious flowering plant (angiosperm), the willow, has been outlined in some detail in an earlier section (A complex life cycle). The life cycle of a gymnosperm is similar.
Macrocystis pyrifera is the largest of all algae. The stage of the life cycle that is usually seen is the sporophyte, which is perennial and individuals persist for many years. Individuals may grow to up to 50 m (160 ft) long or more.
Gelidium is assumed to follow the Polysiphonia life cycle, with sexual and tetrasporangial generations. [3] Tetrasporangia formation is also known to be affected by temperature and other environmental factors including light, salinity and moisture, [ 4 ] although germination rates remain unaffected based on an earlier study.
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