How to identify it?
Fruiting Body
Fruiting body medium sized to large; semicircular, fan-shaped, or tongue-like.
Cap
Cap 7-21 cm across, initially convex, later flattening, and often with a central depression; deep purplish lilac; surface wet and sticky.
Flesh
Flesh thick, soft, watery, white streaked with reddish areas. Taste sour or acidic.
Scientific Classification
Phylum
Club fungi Class
Mushroom-forming fungi Order
Gilled fungi Family
Fistulinaceae Genus
Fistulina Species
Beefsteak fungus 
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