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Stem decay fungus

Fomitopsis pinicola, is a stem decay fungus common on softwood and hardwood trees. Its conk (fruit body) is known as the red belted conk. The species is common throughout temperate Europe and Asia.''' As well as a key producer of brown rot residues that are stable soil components in coniferous forest ecosystems. It has been reported that mushrooms have significant antioxidant activity.

The cap is hoof shaped or triangular, and sometimes shelflike. It is hard and tough, and up to 30 cm or more across and 15 cm thick. Its surface is more or less smooth, at first orange yellow with a white margin, later dark reddish to brown and then frequently with an orange margin. The pore surface is pale yellow to leather brown, 3–4 pores per mm. It grows as thick shelves on live and dead coniferous or (less commonly) deciduous trees. The spores are pale yellow and smooth. due to its woody texture, but it is useful as tinder. The basidiocarps of the fungus have been reported to have medicinal usages in Asia.

This stem decay fungus is found on live conifer trees in southeast Alaska such as Western hemlock, Mountain hemlock, White spruce, Lutz spruce and Sitka spruce. The tree stem decay is caused by the fungus when it invades and colonizes the wood of living trees and decomposes the wood before the tree is dead. This brown rot fungus degrades only cellulose, leaving the other primary constituents of wood, lignin, as a considerably less dense but fairly stable residual structure that is suitable for excavation by woodpeckers. This fungus is normally found on dead pines, but can be found on all conifers. It can also be observed growing on large stem wounds, broken tops, and dead tissue of live trees. In mature forests, these stem decay fungi cause enormous annual wood volume loss of Alaska's major tree species. Approximately one third of the old growth timber board foot volume in Southeast Alaska is defective, largely due to decay from this type of fungus. Conversely, there is very little decay in young growth stands without prevalent wounding from commercial thinning activities, wind damage, or animal feeding. By predisposing large old trees to bole breakage and windthrow, stem decays serve as important small scale disturbance regimes in these temperate rainforest ecosystems where fire and other large scale disturbances are uncommon. This stem decay creates canopy gaps, influences stand structure and succession, increases biodiversity, and enhances wildlife habitat. The fungus also performs essential nutrient cycling functions in these forests by decomposing stems, branches, roots, and boles of dead trees. Cavities created by the fungus in standing trees provide crucial habitat for many wildlife species including bears, voles, squirrels, and a number of bird species. The lack of disturbance in these areas and longevity of individual trees allows ample time for this slow growing decay fungus to cause significant decay. There is a growing interest in acquiring methods to promote earlier development of stem decays in second growth stands to achieve wildlife and other non timber objectives.