Ceratiomyxa | |
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Ceratiomyxa fruticulosa | |
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Genus: | Ceratiomyxa J. Schrot. (1889) |
Type species | |
Ceratiomyxa mucida (Pers.) J. Schröt. | |
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C. fruticulosa Contents |
Ceratiomyxa is a genus of plasmodial slime mould within the Eumycetozoa, first described by Pier Antonio Micheli. They are widely distributed and commonly found on decaying wood.
The plasmodium often appears as white frost-like growth or thin watery layers on wood. Pillar or wall-like sporangia bud from the plasmodium and develop spores that undergo multiple divisions before they release flagellated zoospores. The zoospores will then pair off, undergo plasmogamy, and form zygotes that will later form new plasmodia.
The genus currently contains 4 species. The most notable member is Ceratiomyxa fruticulosa, a slime mould found in most parts of the world. Other known species of Ceratiomyxa are mostly found in the tropics.
Ceratiomyxa comes from the Latin word ceratus meaning "waxed" and the ancient Greek word myxa meaning "mucus".
Ceratiomyxa was first described under the name Puccinia ramose (later revised to Ceratiomyxa fruticulosa) in 1729 by Pier Antonio Micheli, a pioneer of mycology. In 1805, Albertini and Schweinitz described 2 more species in the genus, C. hydnoides and C. porioides. However, because Ceratiomyxa species can take a variety of different forms, many forms first described as species are later considered synonyms. This includes C. hydnoideum and C. porioides which are now often considered synonyms of C. fruticulosa. [1] [2] However, phylogenetic analyses have shown C. porioides should be considered a distinct species. [3]
Ceratiomyxa was first placed in the subclass Ceratiomyxomycetidae of the class Myxomycetes by Martin and Alexopoulos in 1969, but was later moved to subclass Protostelia of the class Eumycetozoa by Olive in 1970. [1] [2]
Ceratiomyxa is commonly found on rotting wood. Large logs and stumps are cited as ideal substrates for growth, although smaller colonies can also be found a tree branches. The Ceratiomyxa collection of Henry C. Gilbert has specimen growing on various evergreen coniferous trees (Pseudotsuga), elm (Ulmus), maple (Acer), oak (Quercus), Tilia, and willows (Salix). A specimen collected by F. O. Grover was found growing on a burlap sack. [1]
Species of Ceratiomyxa can be found world-wide. C. fruticulosa is the most common species and has a cosmopolitan distribution. C. morchella and C. sphaerosperma have only been recorded in the tropics. [4]
Plasmodium: Net-like or thin layer enveloped in mucous. Often translucent or white in colour but can also be tinted slightly yellow, pink, or blue-green. The protoplasm within the plasmodium can be seen flowing, resting, and resuming flow in the opposite direction. This occurs in intervals of approximately 40 seconds. Protoplasmic flow slows as the sporangia develop and halt completely during mitosis. [1]
Sporangia: Can be found in many different forms. Common forms include:
Spores: The spores are round or oval globules individually attached to stalks sprouting from sporangia. Spores vary in size (8-13 μm in diameter). The spore walls are thin and transparent. Spores appear grainy and may have some vacuoles which are often near the perimeter or surrounding the nucleus. The nucleus within the spore is about 3 μm in diameter. [1]
Swarm cells: Oblong with either one long flagellum, one long and one short flagellum, or 2 long flagella. The flagella may occur together or at opposite ends of the cell. Upon emergence, the swarm cells are 6-8 μm in length and can develop to around 12 μm in older cells. [1]
Ceratiomyxa plasmodia is diploid and can often be found emerging from rotting wood and spreading into a thin layer. The plasmodium then fruits to form sporangia: erect pillar or wall-like structures. The sporangia mature in about six hours. Many small stalks emerge from the sporangia to form protospores. Meiosis then begins in the protospores. Synapsis of the chromosomes in prophase is achieved at this stage.
After the stalks have fully elongated, a thin transparent wall is secreted around the protospores to become spores. Spores take approximately 24 hours to mature. The first meiotic division is then completed in the spores followed by a second meiotic division which leaves the spore with 4 nuclei.
After dispersal, these four-nucleate spores germinate and naked protoplasts emerge. The protoplasts take in water upon emergence and enlarge to about 3 times the size of the spore from which they emerged. The protoplasts then form short thread-like filaments that later retract back into round globules. In some cases, the protoplast skips the thread phase and remains isodiametric. The nuclei then migrate to four points of a tetrahedron and the protoplast cleaves into a tetrad of lobes. Soon after, the tetrad undergoes mitosis and splits again into an octette of haploid cells.
Each cell releases a swarm cell with either one long flagellum, 2 unequal flagella, or 2 long flagella. The flagella are apical and whiplash type. The swarm cells may then lose their flagella and become asexual myxamoebae or undergo syngamy in pairs to produce a diploid zygote. [1] [2]
Genus Ceratiomyxa currently includes five species:
A sporangium ; pl.: sporangia) is an enclosure in which spores are formed. 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. Sporangia can produce spores by mitosis, but in land plants and many fungi, sporangia produce genetically distinct haploid spores by meiosis.
A zoospore is a motile asexual spore that uses a flagellum for locomotion in aqueous or moist environments. Also called a swarm spore, these spores are created by some protists, bacteria, and fungi to propagate themselves. Certain zoospores are infectious and transmittable, such as Batrachochytrium dendrobatidis, a fungal zoospore that causes high rates of mortality in amphibians.
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Tetraspora is a genus of green algae in the family Tetrasporaceae of the order Chlamydomonadales, division Chlorophyta. Species of Tetraspora are unicellular green algae that exist in arrangements of four and consist of cells being packaged together in a gelatinous envelope that creates macroscopic colonies. These are primarily freshwater organisms, although there have been few cases where they have been found inhabiting marine environments and even contaminated water bodies. Tetraspora species can be found all around the globe, except in Antarctica. Despite the ubiquitous presence, the greatest growth of the genera's species is seen in the polar climatic zones.
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Crucibulum is a genus in the Nidulariaceae, a family of fungi whose fruiting bodies resemble tiny egg-filled bird's nests. Often called "splash cups", the fruiting bodies are adapted for spore dispersal by using the kinetic energy of falling drops of rain. The "eggs" inside the bird's nests are hard waxy shells containing spores, and tend to stick to whatever nearby herbage they land on, thus increasing the odds of being consumed and dispersed by herbivorous animals. Members of this genus are saprobic, obtaining nutrients from dead organic matter, and are typically found growing on decayed wood and wood debris. The three known Crucibulum species are distinguished from other genera of the Nidulariaceae by their relatively simple funiculus – a cord of hyphae that connects the peridiole to the exterior of the bird's nest.
Myxogastria/Myxogastrea or Myxomycetes (ICN) is a class of slime molds that contains 5 orders, 14 families, 62 genera, and 888 species. They are colloquially known as the plasmodial or acellular slime moulds.
A plasmodium is a living structure of cytoplasm that contains many nuclei, rather than being divided into individual cells each with a single nucleus.
The genus Labyrinthula, also known as net slime molds, is part of the protist group Labyrinthulomycetes and contains thirteen species. The major feature of this genus is the formation of an ectoplasmic net secreted by specialized organelles called bothrosomes which surrounds the colony, which is also used by Labyrinthula for moving. The protist reproduces by zoosporulation as it sets some flagellated spores free from a sporangium. One of the flagella of the zoospores has stiff tripartite hairs (mastigonemes) - the defining characteristic of the stramenopiles.
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Morchella deqinensis is a species of fungus in the family Morchellaceae found in China. It grows in coniferous and mixed forests at an elevation of 2,800–3,200 m (9,200–10,500 ft).
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Maullinia is a genus of intracellular, phytomyxid parasites found across the Southern Hemisphere though primarily in Chile, The Prince Edward Islands, South Africa, Australia, and New Zealand. These parasites infiltrate the cells of their brown algal hosts via cytoplasmic extensions called plasmodia that divide synchronously, becoming increasingly multi-nucleate and engulfing the host cell organelles as they grow. Eventually, as the plasmodia fill the entire cell volume, the host cells become hypertrophied and grow to 3- 4x their original size, showing up as swollen appendages or galls on the host tissue at a macroscopic level. These swollen regions will burst alongside the mature Maullinia plasmodia, releasing biflagellated zoospores to the inter- and extracellular space to disperse the infection further. Zoospores can come from sporangial plasmodia, as in M. ectocarpii, or from resting spores, as in M. braseltonii.
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