かいがらたけ (貝殻茸)

Lenzites betulina

Lenzites betulina

Lenzites betulina

わが国の各地をはじめ、世界中に広く分布しています。夏から秋にかけて、針・広葉樹の枯れ木などに生え、群生します。木材腐朽菌です。傘は半円形の貝殻状で、表面は白色や灰色、灰褐色の狭い環紋があります。肉は薄く、白色で革質です。傘の裏はひだ状でやや疎ら、白色から黄白色をしています。 
サルノコシカケ科カイガラタケ属の一年生キノコで、学名は Lenzites betulina。英名は Multicolor gill polypore。 
The multicolor gill polypore (Lenzites betulina) belongs to Polyporaceae (Bracket fungi family). It is an annual fungus that is widely distributed all over the world, including various parts of Japan. This fungus grows on dead trees such as needles and broad-leaved trees and grows in clusters from summer to fall. It is a wood-rotting fungus. The pileus is semi-circular and has a narrow concentric patterned of white, gray or grayish brown on the surface. The conext is thin, white and leathery. The back of the pileus is pleated and slightly sparse, white to yellowish white. 
岐阜県中津川市「苗木城趾」にて、2004年10月02日撮影。 

Shu Suehiro
shu@botanic.jp