originally posted by Christian Miller (CMM):
In the past 6 months, their black trumpets have been superb. The various sources of chanterelles come and go, some have been excellent with that unique fruity fresh chanterelle flavor, some have been bland. Porcini were a touch on the "diesel" side last Fall. But the morels just never seem to have very much flavor, at least compared to the dried versions or the ones I've had in France.
All that said, my impression was that morels and black trumpets (and perhaps chanterelles?) could not be cultivated, at least not in any commercial sense. Whereas nearly all shitake were farmed.
Mushrooms that make a living by symbiosis with trees are tough to cultivate. This group includes porcini, Craterellus, chanterelles, the tasty Amanitas, and so on. The relationship is hard to simulate.
Shiitake, ordinary champignon, and so on are saprophytic, more or less. They eat decaying wood, which is easily mimicked with sawdust, chips, or logs.
Morels are a bit less clear--they may do some of both. There are cultivated morels, but the ones I had years ago were expensive and not so great. Haven't had any recently.
Your blacks over a 6 month period came from places hundreds or thousands of miles apart, so good taste could be from anywhere. California coastal fall boletes aren't bad, but they aren't as good as the western European ones I've had. Spring boletes from the Seirra are better.
Similarly, your morels came from a variety of places. I would bet that the places I picked last weekend are barren today, and I would promise that for the middle of the week after the heat we're having.
Many mushrooms develop more intense flavors after drying, boletes and morels prominently on the list.
I would hesitate to generalize about the foraged mushrooms in a store from an anecdote or two, except with regard to purchase and care issues like any other vegetable. Are they fresh? Are they well cared for in the store? But sources through a season are extremely variable. Summer chanterelles could be from South Africa or Turkey or Scotland.
The best guarantee of quality, of course, is to pick your own.