The White Morels of North America have ridges that do not darken with maturity, and caps that are (usually) tightly attached to the stem, without forming a substantial “rim” at the point of attachment. Fruit bodies have successfully been grown in the laboratory. R. Ower was the first to describe the developmental stages of ascomata grown in a controlled chamber. This was followed by in-depth cytological studies by Thomas Volk and Leonard (1989, 1990). To study the morel life cycle they followed the development of ascoma fruiting in association with tuberous begonias (Begonia tuberhybrida), from very small primordia to fully developed fruit bodies.
Description: Liquid culture. The White Morels of North America have ridges that do not darken with maturity, and caps that are (usually) tightly attached to the stem, without forming a substantial “rim” at the point of attachment. Deliciosa Morels, with their pointed caps and sparse, vertically arranged ridges, are one group of white morels; the “Classic Yellow Morels” form the other group, in which the caps are larger and (usually) rounder, and the ridges are randomly arranged and densely packed. Classic white and yellow morels are found across the continent, in a wide variety of habitats. These are a more difficult mushroom to produce and require outdoor beds for any degree of success.
Young fruit bodies begin development in the form of a dense knot of hyphae, when suitable conditions of moisture and nutrient availability conditions have been reached. Hyphal knots are underground and cup-shaped for some time, but later emerge from the soil and develop into a stalked fruiting body. Further growth makes the hymenium convex with the asci facing towards the outer side. Because of the unequal growth of the surface of the hymenium, it becomes folded to form many ridges and depressions, resulting in the sponge or honeycomb appearance.