Maitake (Maitake) - Grifola frondosa

Japanese: マイタケ(舞茸) - マイタケ（英語表記）Grifola frondosa

Basidiomycetes, order Aphyllosteganaceae, family Polyporaceae. Large fruiting bodies grow on stumps and the bases of old trees such as oak, chestnut, and beech. It is a harmful fungus that causes white rot in the heartwood of oak, but the young mushrooms are delicious and highly valued. The fruiting bodies are fleshy and become tough when they ripen and dry. They have a cylindrical stem that branches into many parts, and at the end of each branch, small caps grow overlapping with other caps. The entire fruiting body sometimes becomes a mass with a diameter of more than 40 cm and can weigh more than 3 kg. Each cap is semicircular, fan-shaped, or spatula-shaped, with a dark brown or gray surface and a white stem. The underside of the cap produces pores, but the openings are circular or distorted circular. The spores are ovoid or elliptical with small projections and are colorless. Mushrooms that are very similar to this one include Choreimaitake (Choleimaitake), Tonbimaitake (Tobimaitake), and Shiromaitake (G. albicans) .

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

担子菌類ヒダナシタケ目サルノコシカケ科。ミズナラ，クリ，ブナなどの切り株や老木の根もとに大型の子実体を生じる。本来はミズナラの心材について，白色腐朽を起す害菌であるが，若いキノコは美味で珍重される。子実体は肉質で，熟後，乾けば強靭になる。多数に分枝する円柱状の茎を有し，各分枝の先端には小さな傘がほかの傘と互いに重なり合いながらつく。子実体全体はときには径 40cm以上の塊となり，その重さも 3kgをこすものがある。個々の傘は半円形，扇形，へら形で，表面は黒褐色かねずみ色で茎の色は白い。傘の裏面には管孔を生じるが孔口は円形または歪円形。胞子は卵形か楕円形で小突起があり，無色。このキノコによく似たものにチョレイマイタケ (猪苓舞茸)，トンビマイタケ (鳶舞茸)，シロマイタケ G. albicansなどがある。

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