Helvella acetabulum

Helvella acetabulum is a species of fungus in the family Helvellaceae, order Pezizales. This relatively large cup-shaped fungus is characterized by a tan fruit body with prominent branching ribs resembling a cabbage leaf; for this reason it is commonly known as the cabbage leaf Helvella. Other colloquial names include the vinegar cup and the brown ribbed elfin cup. The fruit bodies reaches dimensions of 8 centimetres (3 in) by 4 cm (1+1⁄2 in) tall. It is found in Eurasia and North America, where it grows in sandy soils, under both coniferous and deciduous trees....read more on Wikipedia.