 A 10 @-@ year study of the distribution , time of fruiting and habitats of morel and false morel population in Iowa showed that early false morels are the first morels to fruit in the spring , appearing shortly after leaves begin to form on deciduous trees . <unk> @-@ head morels ( Morchella <unk> ) fruit next , followed by the yellow or white morels ( Morchella esculenta ) , then <unk> Morchella <unk> . The fruit bodies serve as a habitat for breeding <unk> ( flies ) , including <unk> media , <unk> <unk> , and <unk> <unk> . 
