Namidatake (Tear Mushroom) - Gyrophana lacrymans

Japanese: ナミダタケ(涙茸) - ナミダタケ（英語表記）Gyrophana lacrymans

Basidiomycete, Agaricales, Family Zanthaceae. Also called Kakin (house fungus). It attacks lumber in humid places, so caution is required as it is a harmful fungus to wooden buildings. When this fungus attaches to floorboards of a house, the surface may remain unchanged, but the underside becomes very brittle and completely unusable. The fruiting body is soft and membranous, and grows entirely on the back, without forming an umbrella. It is irregular in shape and spreads across the underside of the substrate, yellowish brown in color, and blackish brown when dry, with irregular wrinkled folds and white hyphae surrounding the edges. When raw, it secretes moisture with a moldy smell, hence the name. The fruiting layer forms over the entire fold, and ripe spores are yellowish brown. It is distributed throughout Japan and worldwide.

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

Japanese:

担子菌類ヒダナシタケ目シワタケ科。カキン (家菌) ともいう。湿気の多いところで材木をおかすため，木造建築物の有害菌として注意を要する。この菌が家屋の床板などにつくと，表側は変らないようでも裏側は非常にもろくなって，まったく使用に耐えなくなる。子実体は軟らかい膜質，全背着生で傘ができない。形は不規則で基物の下面に広がり，色は黄褐色，乾くと黒褐色で，不規則な皺状のひだを生じ，縁辺を白い菌糸が取巻く。生のときにはかび臭く水分を分泌するのでこの名がある。子実層はひだの全面にでき，熟した胞子は黄褐色となる。日本全土，また世界的に分布する。

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