Pycnoporellus alboluteus
| Pycnoporellus alboluteus | |
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| Scientific classification | |
| Kingdom: | Fungi |
| Division: | Basidiomycota |
| Class: | Agaricomycetes |
| Order: | Polyporales |
| Family: | Fomitopsidaceae |
| Genus: | Pycnoporellus |
| Species: | P. alboluteus |
| Binomial name | |
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Pycnoporellus alboluteus (Ellis & Everh.) Kotl. & Pouzar (1963) |
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| Synonyms | |
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Pycnoporellus alboluteus, commonly known as the orange sponge polypore, is a species of polypore fungus in the family Fomitopsidaceae. Distributed throughout the boreal conifer zone, the fungus is found in mountainous regions of western North America, and in Europe. It causes a brown cubical rot of conifer wood, especially spruce, but also fir and poplar. The soft, spongy orange fruit bodies grow spread out on the surface of fallen logs. Mature specimens have tooth-like or jagged pore edges. A snowbank mushroom, P. alboluteus can often be found growing on logs or stumps protruding through melting snow. Although the edibility of the fungus and its usage for human culinary purposes are unknown, several species of beetles use the fungus as a food source.
The species was originally described as Fomes alboluteus by Job Bicknell Ellis and Benjamin Matlack Everhart in 1895. Collected by botanist Charles Spencer Crandall, the type specimens were found growing on the charred trunks of Abies subalpina in the mountains of Colorado, at an elevation of 10,000 feet (3,000 m). In its taxonomic history, it has been transferred to several genera. The original authors moved it to Polyporus in 1898, considering it allied to Polyporus leucospongia. They also noted that the pores developed teeth-like elongations like those of genus Irpex. Other generic transfers include Scindalma by Otto Kuntze in the same year,Aurantiporellus by William Alphonso Murrill in 1895, Aurantiporus by Murrill in 1905,Phaeolus by Albert Pilát in 1937, and Hapalopilus by Appollinaris Semenovich Bondartsev and Rolf Singer in 1943. It was given its current name in 1963 when Czech mycologists František Kotlaba and Zdeněk Pouzar placed it in Pycnoporellus.
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