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''Meripilus giganteus'' is a polypore fungus in the Meripilaceae family. It causes a white rot in various types of broadleaved trees, particularly beech (''Fagus''), but also ''Abies'', ''Picea'', ''Pinus'', ''Quercus'' and ''Ulmus'' species. This bracket fungus, commonly known as the giant polypore or black-staining polypore, is often found in large clumps at the base of trees, although fruiting bodies are sometimes found some distance away from the trunk, parasitizing the roots. ''M. giganteus'' has a circumboreal distribution in the northern Hemisphere, and is widely distributed in Europe. In the field, it is recognizable by the large, multi-capped fruiting body, as well as its pore surface that quickly darkens black when bruised or injured. ==Description== The basidiocarps consist of numerous rosette-like flattened fan-shaped pilei; they are typically in diameter and high. The individual caps, up to diameter and thick, arise from a common (basal ) stem.The color of the cap surface is pale tan to dull chestnut brown in young specimens but darkens in age to become concentric zones ((zonate )) of various shades of brown. The surface is also finely (fibrillose ) with tiny scales ((squamules )). There are 3 to 6 pores per millimeter on the underside; the pore surface bruises brown and black, helping to distinguish it from the similar species ''Grifola frondosa''. ;Microscopic features Spores are roughly spherical to ovoid or ellipsoid in shape, with typical dimensions of 6–6.5 × 5.5–6 µm. Under a microscope, they appear translucent (hyaline), smooth, and nonamyloid, meaning that they do not absorb stain from Melzer's Reagant.〔Larsen, M, Lombard, FF. (1988). "The status of ''Meripilus giganteus'' (Aphyllophorales, Polyporaceae) in North America." ''Mycologia'' 80(5):612–21.〕 The basidia—the spore-bearing cells—are club-shaped, 4-spored, and are 22–40 by 7–8 µm. Polypore fungi may be further distinguished by the type of hyphae that makes up their fruiting body. ''M. giganteus'' has a so-called monomitic hyphal system, as its fruiting body is composed of only vegetative hyphae. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Meripilus giganteus」の詳細全文を読む スポンサード リンク
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