Morchella semilibera

Common Name: None.
Description: Cap 1.5-4cm high, bluntly to sharply conical, with conspicuous vertical ridges and pits; ridges are blackish brown while pits are yellowish brown; margin of cap is free of stem for nearly half of cap radius. Stem 50-100 by 5-40 mm high and wide.
Habitat: in mixed hardwoods. Found throughout North America.
Edible: good.

Source: Mushrooms of North America by Roger Phillips.