Basidiomycetes Pdf

Basidium structure and spore release Hymenomycetes Basidia develop on the surface of gills or pores of the fruiting body. Ballistic basidiospores are formed on sterigmata which are tapered spine-like projections on basidia, and are typically curved, like the horns of a bull. Wallemiomycetes Bartheletiomycetes Tremellomycetes. Time-lapse images of the life cycle processes are available see Further Reading.

Basidiomycetes Characteristics and Life Cycle

Eventually the host is infected by infectious hyphae. Typically haploid Basidiomycota mycelia fuse via plasmogamy and then the compatible nuclei migrate into each other's mycelia and pair up with the resident nuclei. Wikimedia Commons has media related to Basidiomycota.

Name different types of ecological pyramids. Some jelly fungi have a yeast-like stage in their life cycles. The compartment so formed enlarges into a club-shaped swelling.

Cords are also formed by some ectomycorrhizal basidiomycetes see below. Urediospores are dikaryotic and can infect the same host that produced them.

Many variations on these general themes occur. After meiosis two nuclei enter each spore and a mitotic division may follow.

Cryptococcus neoformans and Cryptococcus gattii. In other projects Wikimedia Commons Wikispecies.

Unicellular saprotrophs on plant surfaces Basidiomycete saprotrophs include unicellular fungi yeast which are part of the ubiquitous microora of plant surfaces. In summary, meiosis takes place in a diploid basidium.

The monokaryons are neither male nor female. This is done by making a spore print, by placing a mushroom cap on paper for several hours. After spore formation, the basidium remains and contains a large vacuole, and may also contain the remaining nuclei if meiosis was followed by mitosis.


Following meiosis, mitotic divisions can occur in the basidium. However, unlike gametes they are all alike in shape, and differ from each other only in their mating type alleles. The Basidiomycetes resemble the Ascomycetes in possessing septate hyphae and production of non-motile spores and fructifications. Collodictyonidae Mantamonadidae Rigifilida. Other genera that commonly decay building timbers include Coniophora, Trametes, Lentinus and Gloeophyllum.

In some smuts such as Ustilago maydis the nuclei migrate into the promycelium that becomes septate i. The basidiospores are ballistically discharged and start new haploid mycelia called monokaryons. Smuts with both a yeast phase and an infectious hyphal state are examples of dimorphic Basidiomycota.

Basidiomycetes Characteristics and Life Cycle

As well as new cell types, metabolic changes occur, notably production of secondary metabolites evident as the pigments, toxins and avours associated with mushrooms. Agaricomycotina Pucciniomycotina Ustilaginomycotina Class Incertae sedis no subdivisions Wallemiomycetes. Symbiosis with the fungus enables the ants to feed on a wide variety of plant material which is converted into nutrient-rich fungal food by the mycelium. Hymenomycete Dacrymycetales Agaricomycetes. Such basidiomycete yeasts include the widespread and abundant yeasts, Sporidiales, which are members of the microscopic ora of plant surfaces.

Sarah C Watkinson University of Oxford Oxford UK

Definition of Basidiomycetes at

The process is as follows. Products of mating type genes, including transcription factors, and pheremones and their receptors, are essential for the development of the dikaryotic phase. The basidiospores of these non-ballistosporic basidia may either bud off, or be released via dissolution or disintegration of the basidia.


Some species cause specic, well-known decay problems. Reproduction in Phycomycetes With Diagram Fungi.

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Dacrymycetales Agaricomycetes. The primary mycelium often produces oidia. Many used as food are cultivated in a large-scale for marketing. The main commercially produced mushroom is Agaricus bisporus, worth millions of pounds sterling per annum in. The two groups probably originated from a common ancestor during the evolution of life on land.

Basidiospore release and dispersal in hymenomycetes When the fruiting body is mature the basidiospores are produced from basidia on the hymenial surface. Infection is by inhalation of spores present in bird droppings.

The haplophase is also well represented. Often, the dikaryotic mycelium is more vigorous than the individual monokaryotic mycelia, and proceeds to take over the substrate in which they are growing. These react with the complex aromatic lignin molecule to produce a short-lived unstable aromatic free radical which breaks into a variety of molecular fragments.

The general life-cycle pattern of the Basidiomycetes has resemblance with that of the Ascomycetes. The Basidiomycetes comprise the highest group of fungi which are often noticed conspicuously occurring in fields and forest areas. The most important roles of basidiomycetes in ecosystems are as wood decomposers, as symbionts of plants, azotobacter biofertilizer pdf and as plant parasites. Whereas others are responsible for the decay of fallen logs of wood. The selective advantage presumably conferred by dikaryosis is poorly understood.