Yellow Morel (Common Morel)
Honeycombed cap with yellow to yellow-gray to yellow-brown ridges and pits; completely hollow. April and early May. Cap oval to elongate, with randomly arranged and oriented ridges and pits; ridges and pits are yellow to yellow-gray to yellow-brown; deeply pitted; hollow; bottom of cap is fused to the stalk. Stalk sometimes enlarged at the base; whitish; ribbed; hollow. Spore print creamy yellow to ocher-yellow. Spores magnified are elliptical, smooth. Spores are located inside the pits. The yellow morel can be small and grayish, but later in the season it can be very large, up to 12 inches high.
Lookalikes: The poisonous false morels (Gyromitra caroliniana and G. brunnea) are reddish and have wrinkled, lobed, or brain-shaped caps and dense (not hollow) stalks. The bottom half of the cap of the half-free morel (M. punctipes) hangs free from the stalk. The cap of the black morel (M. angusticeps) has blackish or dark brown ridges and is more conical.