Heterobasidion annosum
| Heterobasidion annosum | |
|---|---|
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| Scientific classification | |
| Kingdom: | Fungi |
| Division: | Basidiomycota |
| Class: | Agaricomycetes |
| Order: | Russulales |
| Family: | Bondarzewiaceae |
| Genus: | Heterobasidion |
| Species: | H. annosum |
| Binomial name | |
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Heterobasidion annosum (Fr.) Bref. (1888) |
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| Synonyms | |
|
Boletus annosus |
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| Heterobasidion annosum | |
|---|---|
| Mycological characteristics | |
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pores on hymenium |
 
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no distinct cap or offset |
 |
hymenium is decurrent |
 
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lacks a stipe or is bare |
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spore print is white |
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ecology is parasitic |
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edibility: inedible |
Boletus annosus
Boletus cryptarum
Fomes annosus
Fomes annosus f. cryptarum
Fomes cryptarum
Fomitopsis annosa
Friesia annosa
Heterobasidion annosum f. cryptarum
Heterobasidion cryptarum
Physisporus makraulos
Placodes annosus
Polyporus annosus
Polyporus cryptarum
Polyporus fuscus
Polyporus irregularis
Polyporus makraulos
Polyporus marginatoides
Polyporus scoticus
Polyporus subpileatus
Polystictoides fuscus
Polystictus cryptarum
Poria cryptarum
Poria macraula
Pycnoporus annosus
Scindalma annosum
Scindalma cryptarum
Spiniger meineckellus
Spongioides cryptarum
Trametes annosa
Trametes radiciperda
Ungulina annosa
Ungulina annosa f. cryptarum
Ungulina annosa f. makraulos Heterobasidon irregulare
no distinct cap
lacks a stipe
Heterobasidion annosum is a basidiomycete fungus in the family Bondarzewiaceae. It is considered to be the most economically important forest pathogen in the Northern Hemisphere. Heterobasidion annosum is widespread in forests in the United States and is responsible for the loss of one billion U.S. dollars annually. This fungus has been known by many different names. Commonly, it is also known as annosum root rot. First described by Fries in 1821, it was known by the name Polyporus annosum. Later, it was found to be linked to conifer disease by Robert Hartig in 1874, and was renamed Fomes annosus by H. Karsten. Its current name of Heterobasidion annosum was given by Brefeld in 1888. Heterobasidion annosum is one of the most destructive diseases of conifers.
The fruiting bodies of the fungi, which are also known as basidiocarps, are normally brackets which are whitish around the margins and dark brown on the uneven, knobbly upper surface. However they can also take a resupinate form, consisting only of a white crust which corresponds to the underside of the bracket. Basidiocarps are up to about 40 cm in diameter and 3.5 cm thick. The fertile surface of the fruiting body is white, easily bruising brown, and has barely visible pores, with 3-4 per mm. The flesh, which has a strong fungus smell, is elastic when young but becomes woody when older.
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