Myxomycetes


Myxomycetes

▪ protist phylum
also called  Mycetozoa,  
 phylum of funguslike organisms within the kingdom Protista, commonly known as true slime molds. They exhibit characteristics of both protozoans (one-celled microorganisms) and fungi. Distributed worldwide, they usually occur in decaying plant material. About 500 species have been described.

      The vegetative (active, growing, feeding) phase consists of a multinucleate amoeboid mass or sheet (plasmodium). This gives rise to fruiting structures (sporangia) with one to many spores at the head of a stalk. In nearly all species, spores are borne within the sporangium. In Ceratiomyxa, spores are apparently borne externally; each, however, may be a much-reduced sporangium with a true spore within.

      Upon germination, a spore releases one or more individual cells known as myxamoebas, which may transform into so-called swarm cells with two flagella (whiplike structures used in swimming). The swarm cells often revert to the amoeboid stage. Formerly, it was believed that reproduction involved the nonsexual fusion of swarm cells, but the process is now thought to be sexual.

      The plasmodium, with cytoplasm streaming through it, changes shape as it crawls over or within damp wood, leaves, or soil, ingesting bacteria, molds, and fungi. Characteristically, the entire plasmodium is covered by a layer of slime, which is continually secreted and, as the plasmodium creeps, continually left behind as a network of collapsed tubules. Plasmodia are frequently yellow and orange, but they may also be colourless, red, white, buff, maroon, or, rarely, blue, black, or green.

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Universalium. 2010.

Look at other dictionaries:

  • Myxomycetes — Myxomycètes Myxomycetes …   Wikipédia en Français

  • MYXOMYCÈTES — Placés par la quasi unanimité des mycologues à la base de la classification des Champignons, à proximité des Procaryotes (Actinomycètes, Bactéries), et, ainsi, à la lisière même des règnes animal et végétal, les Myxomycètes sont effectivement des …   Encyclopédie Universelle

  • Myxomycetes — Myx o*my*ce tes, n. pl. [NL.; Gr. ? mucus, slime + myceles.] (Bot.) A class of peculiar organisms, the slime molds, formerly regarded as animals (Mycetozoa), but now generally thought to be plants and often separated as a distinct phylum… …   The Collaborative International Dictionary of English

  • Myxomycetes — Myxomycētes, Schleimpilze, Pilztiere, den niedersten Tierformen nahe stehende Pilze, deren vegetativer Körper eine aus vielen Individuen gebildete schleimige, kriechende Protoplasmamasse (Plasmodium) ist und meist auf verwesenden organischen… …   Kleines Konversations-Lexikon

  • Myxomycetes —   [zu griechisch mýkēs »Pilz«], wissenschaftlicher Name der Schleimpilze …   Universal-Lexikon

  • Myxomycètes — Myxomycetes …   Wikipédia en Français

  • Myxomycetes — Schleimpilze Gelbe Lohblüte (Fuligo septica) Systematik Klassifikation: Lebewesen …   Deutsch Wikipedia

  • Myxomycetes — noun the class of true slime molds; essentially equivalent to the division Myxomycota • Syn: ↑class Myxomycetes • Hypernyms: ↑class • Member Holonyms: ↑Myxomycota, ↑division Myxomycota, ↑Gymnomycota, ↑ …   Useful english dictionary

  • Myxomycetes — …   Википедия

  • Myxomycetes — A class of fungi containing the slime molds, which occur on rotting vegetation but are not pathogenic for humans. [myxo + G. mykes, fungus] * * * Myxo·my·ce·tes mī sēt ēz n pl a class of organisms of uncertain systematic position that include the …   Medical dictionary


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