In phycology, conceptacles are specialised cavities of seaweeds that contain the reproductive organs. Phycology (from Greek grc φύκος phykos, "seaweed" and grc -λογία -logia) or algology (from Latin Seaweed is a loose colloquial term encompassing macroscopic Multicellular, benthic marine Algae. They are situated in the receptacles and open by a small ostiole. Botanical meaning In Botany, the receptacle is the thickened part of a stem from which the Flower organs grow An ostiole is a small hole or opening through which Alga or Ascomycetes Fungi release their mature Spores [1] The term is used in reference to the Corallinaceae,[2] however they are rarely referred to in any other alga except the Fucales in which they are one of the major characteristics. Coralline algae are Red algae in the Family Corallinaceae of the order Corallinales. Fucales is an order in the Phylum Phaeophyta or Brown algae. Members of this order are fucoids In the Fucales there is no haploid phase in the reproductive cycle and therefore no alternation of generations. "Haplo" redirects here For the fictional character see The Death Gate Cycle. The Alternation of phases (or generations) describes the life cycle of Plants Fungi and Protists A multicellular Diploid phase alternates [3] The thallus is a sporophyte. For the chronologer/historian occasionally mentioned in the works of early Christian writers see Thallus (historian. All land plants and some Algae, have life cycles in which a haploid Gametophyte generation alternates with a Diploid sporophyte, the generation of a [4] The diploid plants produce male (antheridia) and female (oogonia) gametangia by meiosis. "Haplo" redirects here For the fictional character see The Death Gate Cycle. An antheridium (plural antheridia) is a Haploid structure or organ producing and containing male Gametes (called antherozoids or Sperm An oogonium (plural oogonia) is an Immature ovum. It is a female Gametogonium. In Biology or life science meiosis (pronounced my-oh-sis is a process of reductional division in which the number of chromosomes per cell is cut in half The gametes are released into the sea, after fusion the zygote settles and begins growth. A gamete (from Ancient Greek γαμέτης; translated gamete = wife gametes = husband is a cell that fuses with another gamete For other meanings see Zygote (disambiguation. A zygote (from Greek ζυγωτός zugōtos "joined" or "yoked" [5]
There are other similar structures: cryptostomata are similar to conceptacles but differ having only hairs and are sterile. [5] Caecostomata, are found only in Fucus distichus, in these the ostiole becomes blocked during development. [1]
See also
References
- ^ a b Boney, A. Botanical meaning In Botany, the receptacle is the thickened part of a stem from which the Flower organs grow D. (1969). A Biology of Marine Algae. Hutchinson Educational Ltd, London
- ^ Irvine, L. M. and Chamberlain, Y. M. (1994). Seaweeds of the British Isles. Volume 1, Part 2B. Natural History Museum, London. The Natural History Museum is one of three large Museums on Exhibition Road, South Kensington, London (the others are the Science Museum ISBN 0 11 3100167
- ^ Fritsch, F. E. (1945). The Structure and Reproduction of the Algae. Vol 2. Cambridge University Press, Cambridge
- ^ Smith, G. M. (1938). Cryptogamic Botany. Algae and Fungi. Second edition, Volume 1, McGraw-Hill Bok Company, Inc.
- ^ a b Flecher, R. L. (1987). Seaweeds of the British Isles. Volume 3, Part 1. British Museum (Natural History), London. ISBN 0-565-00992-3
Further references
http://www.mbari.org/staff/conn/botany/browns/Cystoseira/lifehistory.htm
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