Reproductive Strategy & Life Cycle of the Common Morel Mushroom

Morels produce mushrooms when conditions are right.

In contrast to the predictable life cycle of most organisms, the life cycle of the morel is variable. It varies with environmental conditions that are not yet completely understood.

Sclerotium

When unfavorable conditions arise, such as a prolonged dry spell, the morel can assume a hardy, resistent form called a sclerotium. In temperate regions, this happens regularly when winter sets in.

Spring Options

In spring, the sclerotium germinates. It will sometimes form a fruiting body. But instead it might grow only vegetative strands called mycelia.

Asexual Reproduction

Mycelia may reproduce by growing asexual conidiospores--tiny particles that can grow into new morels. This is an easy way to reproduce because the reproductive structure is not a complex fruiting body, but a simple modified fungal cell.

Favorable Genetic Variation

Morel cells have many nuclei. The nuclei are not always genetically alike, since two plants often unite to form a single plant. This gives the morel the advantage of greater genetic variation when it reproduces sexually.

Timely Sexual Reproduction

Morels form symbiotic unions with trees. If the tree dies and the morel lacks nutrients, it grows a mushroom that produces sexual spores. Wind or rain triggers a vigorous expulsion of spores, which may land in a more favorable location.

References

• US Forest Service: Ecology and Management of Morels Harvested From the Forests of ...
• Oxford Journals--Journal of Heredity: A First Assessment of Genetic Variation Among Morchella ...
• NCBI: Physiological and Environmental Studies of Sclerotium Formation and Maturation in Isolates of Morchella Crassipes
• American Mushroom Hunter: The Morel Life Cycle