Epithallus

	Epithallus The epithallium or epithallus is the outer layer of a crustose coralline alga, which in some species is periodically shed to prevent organisms from attaching to and overgrowing the alga. Structure It is defined as the cells above the wikt:intercalary, intercalary meristem; these are not involved in photosynthesis. In ''Phymatolithon'', the epithallium is usually one cell thick, whereas in other genera, such as ''Pseudolithophyllum'', multiple cells exist, with the thickness determined by the difference between their rate of production at the intercalary meristem, and the rate of shedding at the surface; thicknesses of 16 cells or more, spanning 100 µm, have been measured in a representative coralline (''Clathromorphum''). The thickness is variable within species; in ''Lithothamnion'', a single cell thickness is the norm, but three- or four-cell thick regions are also common. The epithallus sometimes overlies the roof of conceptacles, which are exposed only when the overlying ep ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Coralline Alga Coralline algae are red algae in the order Corallinales. They are characterized by a thallus that is hard because of calcareous deposits contained within the cell walls. The colors of these algae are most typically pink, or some other shade of red, but some species can be purple, yellow, blue, white, or gray-green. Coralline algae play an important role in the ecology of coral reefs. Sea urchins, parrot fish, and limpets and chitons (both mollusks) feed on coralline algae. In the temperate Mediterranean Sea, coralline algae are the main builders of a typical algal reef, the ''Coralligène'' ("coralligenous"). Many are typically encrusting and rock-like, found in marine waters all over the world. Only one species lives in freshwater. Unattached specimens (maerl, rhodoliths) may form relatively smooth compact balls to warty or fruticose thalli. A close look at almost any intertidal rocky shore or coral reef will reveal an abundance of pink to pinkish-grey patches, distributed throug ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Intercalary Intercalation may refer to: Intercalation (chemistry), insertion of a molecule (or ion) into layered solids such as graphite Intercalation (timekeeping), insertion of a leap day, week or month into some calendar years to make the calendar follow the seasons Intercalation (university administration), period when a student is officially given time off from studying for an academic degree Intercalation (geology), a special form of interbedding, where two distinct depositional environments in close spatial proximity migrate back and forth across the border zone Intercalary chapter, a chapter in a novel that does not further the plot. See also frame story (sometimes called intercalation). In biology: Intercalary segment, an appendage-less segment in the segmental composition of the heads of insects and Myriapoda Intercalation (biochemistry), process discovered by Leonard Lerman by which certain drugs and mutagens insert themselves between base pairs of DNA Intercalated cel ... [...More Info...] [...Related Items...] OR:** [Wikipedia] [Google] [Baidu]
	Phymatolithon ''Phymatolithon'' is a genus of non geniculate coralline red algae, known from the UK, and Australia. It is encrusting, flat, and unbranched; it has tetrasporangia and bisporangia borne in multiporate conceptacles. Some of its cells bear small holes in the middle; this distinctive thallus texture is termed a "''Leptophytum''-type" thallus surface, and has been posited as a taxonomically informative character. It periodically sloughs off its epithallus The epithallium or epithallus is the outer layer of a crustose coralline alga, which in some species is periodically shed to prevent organisms from attaching to and overgrowing the alga. Structure It is defined as the cells above the wikt:intercala ..., reducing its overgrowth by algae by as much as 50% compared to bare rock. References Red algae genera Corallinales {{Rhodophyta-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Conceptacle Conceptacles are specialized cavities of marine and freshwater algae that contain the reproductive organs. They are situated in the receptacle and open by a small ostiole.Boney, A.D. (1969). ''A Biology of Marine Algae''. Hutchinson Educational Ltd, London Conceptacles are present in Corallinaceae,Irvine, L.M. and Chamberlain, Y.M. (1994). ''Seaweeds of the British Isles''. Volume 1, Part 2B. Natural History Museum, London. and Hildenbrandiales, as well as the brown Fucales. In the Fucales there is no haploid phase in the reproductive cycle and therefore no alternation of generations.Fritsch, F.E. (1945). ''The Structure and Reproduction of the Algae''. Vol 2. Cambridge University Press, Cambridge The thallus is a sporophyte.Smith, G.M. (1938). ''Cryptogamic Botany. Algae and Fungi''. Second edition, Volume ''1'', McGraw-Hill Bok Company, Inc. The diploid plants produce male (antheridia) and female (oogonia) gametangia by meiosis. The gametes are released into the surrounding wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Chondrus ''Chondrus'' is a genus of red algae containing 11 accepted species: ''Chondrus armatus'' (Harvey) Okamura '' Chondrus canaliculatus'' (C.Agardh) Greville ''Chondrus crispus'' Stackhouse ''Chondrus elatus ''Chondrus'' is a genus of red algae containing 11 accepted species: ''Chondrus armatus'' (Harvey) Okamura ''Chondrus canaliculatus'' (C.Agardh) Greville ''Chondrus crispus'' Stackhouse ''Chondrus elatus'' Holmes ''Chondrus giganteus'' Yend ...'' Holmes '' Chondrus giganteus'' Yendo '' Chondrus ocellatus'' Holmes '' Chondrus pinnulatus'' (Harvey) Okamura '' Chondrus uncialis'' Harvey & Bailey '' Chondrus verrucosus'' Mikami '' Chondrus yendoi'' Yamada & Mikami References External links Red algae genera Gigartinaceae Taxa named by John Stackhouse {{red alga-stub ... [...More Info...] [...Related Items...] OR:* [Wikipedia] [Google] [Baidu]
picture info	Ascophyllum ''Ascophyllum nodosum'' is a large, common cold water seaweed or brown alga (Phaeophyceae) in the family Fucaceae, being the only species in the genus ''Ascophyllum''. It is a seaweed that only grows in the northern Atlantic Ocean, also known in localities as feamainn bhuí, rockweed, Norwegian kelp, knotted kelp, knotted wrack or egg wrack. It is common on the north-western coast of Europe (from the White Sea to Portugal) including east Greenland and the north-eastern coast of North America, its range further south of these latitudes being limited by warmer ocean waters. Description ''Ascophyllum nodosum'' has long tough and leathery fronds,Bunker, F.StP., Maggs, C.A., Brodie, J.A. and Bunker, J.A. 2017. ''Seaweeds of Britain and Ireland.'' Second Edition. Wild Nature Press, Plymouth, UK. irregularly dichotomously branched fronds with large, egg-shaped air bladders set in series at regular intervals along the fronds and not stalked. The fronds can reach 2 m in length and a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Halidrys ''Halidrys'' is a genus of brown algae belonging to the family Sargassaceae Sargassaceae is a family of brown algae in the order Fucales The Fucales (fucoids) are an order in the brown algae (class Phaeophyceae). The list of families in the Fucales, as well as additional taxonomic information on algae, is publicly ac .... The species of this genus are found in Europe and Northern America. Species: '' Halidrys dioica'' '' Halidrys siliquosa'' References {{Taxonbar, from=Q18377334 Fucales Fucales genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Himanthalia ''Himanthalia'' is a genus of brown algae. It is the only genus in the family Himanthaliaceae in the order Fucales. It includes two species: '' Himanthalia durvillei'' and ''Himanthalia elongata ''Himanthalia elongata'' is a brown alga in the order Fucales, also known by the common names thongweed, sea thong and sea spaghetti. It is found in the north east Atlantic Ocean and the North Sea. According to the World Register of Marine Speci ...''. References {{Taxonbar, from1=Q18364313, from2=Q18364310 Fucales Fucales genera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
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