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Chytridiomycota are a division of zoosporic organisms in the kingdom Fungi, informally known as chytrids. The name is derived from the Ancient Greek χυτρίδιον, meaning "little pot", describing the structure containing unreleased zoospores. Chytrids are one of the earliest diverging fungal lineages, and their membership in kingdom Fungi is demonstrated with chitin cell walls, a posterior whiplash flagellum, absorptive nutrition, use of glycogen as an energy storage compound, and synthesis of lysine by the α-amino adipic acid (AAA) pathway.
The Oomycetes, or Oomycota, form a distinct phylogenetic lineage of fungus-like eukaryotic microorganisms within the Stramenopiles. They are filamentous and heterotrophic, and can reproduce both sexually and asexually. Sexual reproduction of an oospore is the result of contact between hyphae of male antheridia and female oogonia; these spores can overwinter and are known as resting spores. Asexual reproduction involves the formation of chlamydospores and sporangia, producing motile zoospores. Oomycetes occupy both saprophytic and pathogenic lifestyles, and include some of the most notorious pathogens of plants, causing devastating diseases such as late blight of potato and sudden oak death. One oomycete, the mycoparasite Pythium oligandrum, is used for biocontrol, attacking plant pathogenic fungi. The oomycetes are also often referred to as water molds, although the water-preferring nature which led to that name is not true of most species, which are terrestrial pathogens.
Hyphochytrids are eukaryotic organisms in the group of Stramenopiles (Heterokonta).
Rhizophydium graminis is a plant pathogen infecting the roots of both monocots including wheat and other Poaceae, and a few dicots.
Achlya klebsiana is a plant pathogen. Studies say that this fungi potentially poses threats against fish in the Nile.
Members of the Monoblepharidomycetes have a filamentous thallus that is either extensive or simple and unbranched. They frequently have a holdfast at the base. In contrast to other taxa in their phylum, some reproduce using autospores, although many do so through zoospores. Oogamous sexual reproduction may also occur.
Blastocladiomycota is one of the currently recognized phyla within the kingdom Fungi. Blastocladiomycota was originally the order Blastocladiales within the phylum Chytridiomycota until molecular and zoospore ultrastructural characters were used to demonstrate it was not monophyletic with Chytridiomycota. The order was first erected by Petersen for a single genus, Blastocladia, which was originally considered a member of the oomycetes. Accordingly, members of Blastocladiomycota are often referred to colloquially as "chytrids." However, some feel "chytrid" should refer only to members of Chytridiomycota. Thus, members of Blastocladiomyota are commonly called "blastoclads" by mycologists. Alternatively, members of Blastocladiomycota, Chytridiomycota, and Neocallimastigomycota lumped together as the zoosporic true fungi. Blastocladiomycota contains 5 families and approximately 12 genera. This early diverging branch of kingdom Fungi is the first to exhibit alternation of generations. As well, two (once) popular model organisms—Allomyces macrogynus and Blastocladiella emersonii—belong to this phylum.
Stefan T. Buczacki is a British horticulturist, botanist, biographer, novelist and broadcaster.
A fungus is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. These organisms are classified as one of the traditional eukaryotic kingdoms, along with Animalia, Plantae and either Protista or Protozoa and Chromista.
Phycomycetes is an obsolete polyphyletic taxon for certain fungi with aseptate hyphae. It is used in the Engler system. Asexual reproduction takes place by zoospores (motile) or by Aplanospores (non-motile). These spores are endogenously produced in sporangium. A zygospore is formed by fusion of two gametes. These gametes are similar in morphology (isogamous) or dissimilar.
Rozella is a fungal genus of obligate endoparasites of a variety of hosts, including Oomycota, Chytridiomycota, and Blastocladiomycota. Rozella was circumscribed by French mycologist Marie Maxime Cornu in 1872. Considered one of the earliest diverging lineages of fungi, the widespread genus contains 27 species, with the most well studied being Rozella allomycis. Rozella is a member of a large clade of fungi referred to as the Cryptomycota/Rozellomycota. While some can be maintained in dual culture with the host, most have not been cultured, but they have been detected, using molecular techniques, in soil samples, and in freshwater and marine ecosystems. Zoospores have been observed, along with cysts, and the cells of some species are attached to diatoms.
The University of Michigan Herbarium is the herbarium of the University of Michigan in Ann Arbor, Michigan, in the United States. One of the most-extensive botanical collections in the world, the herbarium has some 1.7 million specimens of vascular plants, algae, bryophytes, fungi, and lichens, and is a valuable resource for teaching and research in biology and botany. The herbarium includes many rare and extinct species.
Synchytrium is a large genus of plant pathogens within the phylum Chytridiomycota. Species are commonly known as false rust or wart disease. Approximately 200 species are described, and all are obligate parasites of angiosperms, ferns, or mosses. Early species were mistakenly classified among the higher fungi because of their superficial similarity to the rust fungi. Anton de Bary and Mikhail S. Woronin recognized the true nature of these fungi and established the genus to accommodate Synchytrium taraxaci, which grows on dandelions, and S. succisae, which grows on Succisa pratensis. Synchytrium taraxaci is the type of the genus. The genus has been divided into 6 subgenera based on differences in life cycles.
Olpidium is a fungal genus in the family Olpidiaceae. Members of Olpidium are zoosporic pathogens of plants, animals, fungi, and oomycetes.
Neocallimastix patriciarum is a species of fungus that lives in the rumen of sheep and other ruminant species. N. patriciarum is an obligate anaerobe and is an important component of the microbial population within the rumen. Only one of a few rumen fungi, this species is interesting and unique within the fungal world. Originally thought to be a flagellate protists, species within the phylum Neocallimastigomycota were first recognized as a fungus by Colin Orpin in 1975 when he demonstrated that they had cell walls of chitin
Frederick Kroeber Sparrow was an American mycologist. He was known for his research on aquatic fungi, and in particular the genus Physoderma, and he produced a well-received monograph in 1943 titled The Aquatic Phycomycetes Exclusive of the Saprolegniacea and Pythium; this was republished in 1960 as Aquatic Phycomycetes.
Howard C. Whisler (1931–2007) was an American mycologist. Born in Oakland, California, he attended Berkeley schools and then Palo Alto High School. Howard worked on his undergraduate degree at Oregon State College for two years and then went to the University of California, Berkeley, where he completed a Bachelor of Science degree in plant pathology in 1954. He joined the United States Air Force from 1954 to 1956 stationed in Italy. He returned to University of California, Berkeley after his military life and had finished his doctoral degree with Ralph Emerson in 1960. From 1960 to 1961 he held a post doctoral NATO-NSF Fellowship in France, at the Université de Montpellier. Howard was appointed assistant professor of Botany at McGill University in 1961. He was appointed to the faculty at the University of Washington on March 15, 1963 and worked until he died on September 16, 2007, at the age of 76.
Mycoplankton are saprotrophic members of the plankton communities of marine and freshwater ecosystems. They are composed of filamentous free-living fungi and yeasts that are associated with planktonic particles or phytoplankton. Similar to bacterioplankton, these aquatic fungi play a significant role in heterotrophicmineralization and nutrient cycling. Mycoplankton can be up to 20 mm in diameter and over 50 mm in length.
Blastocladia is a genus of aquatic fungi.
Cladochytriales is an order of chytrid fungi. It is the only order in the monotypic class Cladochytriomycetes. The order was described in 2009 to accommodate a monophyletic clade containing many genera of chytrid fungi often observed growing over decaying plant tissue and other cellulosic substrates from aquatic habitats and humid soils.
References
- ↑ Sparrow, F. K. (1973). Mastigomigotina (zoosporic fungi). In: Ainsworth, G.C., Sparrow, F.K. & Sussman, A.S. (eds). The Fungi: An Advanced Treatise, vol IV B. Academic Press, New York, pp. 61-73, . From Barr (2001), .
- ↑ Wong, G. J.: Classification of Fungi . URL last accessed 2007-04-03.
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