Verpa Bohemica - Ecology, Habitat and Distribution

Ecology, Habitat and Distribution

The fruit bodies of V. bohemica grow singly or scattered on the ground in woods in early spring, often before the appearance of the morel, and throughout the morel season. It is often found along riverbanks, near cottonwoods, willows and aspens, often buried in plant litter. The fungus prefers to fruit in moist areas with ample sunlight. Its minimum growth temperature is 3 °C (37 °F), with an optimum of 22 °C (72 °F), and a maximum of about 30 °C (86 °F). A study of carbon and nitrogen isotope ratios indicated that Verpa bohemica is saprobic, that is, obtaining nutrients from decomposing organic matter. It has been suggested, however, that the fungus is mycorrhizal for at least part of its life cycle. The fungus has a wide distribution throughout northern North America; its range extends south to the Great Lakes in the Midwestern United States, and south to northern California on the West Coast. In Europe, the fungus is widely distributed, and has been collected from Austria, the Czech Republic, Denmark, Finland, Germany, Norway, Poland, Russia, Slovenia, Spain, Sweden, and the Ukraine. In Asia, it has been recorded from India and Turkey.

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. Narrow-head morels (Morchella angusticeps) fruit next, followed by the yellow or white morels (Morchella esculenta), then lastly Morchella crassipes. The fruit bodies serve as a habitat for breeding dipterans (flies), including Porricondyla media, Pegomya geniculata, and Trichocera annulata.