From here . (for morels) "A "Canning" recipe I found a canning recipe and I think I might like this better than freezing or drying.
Sterilize wide mouth pint canning jars and add 1 teaspoon canning salt.
Fill jars with Morels......They sure look pretty when I set the morels in the jar stem down around the outside and stacked full and tight in the center.
Add room temperature distilled water or reverse osmosis (r/o) water straight from the tap
Pressure cook for 30 mimutes at 10 lbs pressure.
BOY do these look beautiful.......when the mushrooms come out of the pressure canner there look like the jar has alot of water on the bottom....when cooled the morels seem to sick toward the bottom .....They look and taste GREAT. This recipe was given to me by a migrant morel hunter and he claims to have gotten the recipe from an old Amish cookbook.
NOTE: DON'T throw the the water you drain off the mushrooms away ...add it to your gravy ........ITS the BEST.
follow up note: Make sure you note that mushrooms of any type should never be canned in quarts.....pints or half pints/jelly jars. Hope anyone that tries the recipe enjoys them as much as myself. Courtesy of Cindy in Ohio "
From this website "5 Canning - Since mushrooms have insufficient acid, they are susceptible to Clostridium botulinum (botulin) contamination and require pressure canning to be safely canned. Refer to are reliable canning guide and follow manufacturers specifications and instructions exactly
Advantages - Versatility of product. If properly done, anything can be canned, so stews, soups, preparations containing mushrooms can be prepared, then canned.
Disadvantages - Expensive, sometimes finicky equipment is necessary, complicated processes and preparation possible and very strict adherence to methods, procedures and techniques is an absolute must. This is not a method where one can cut corners.
6. Pickling - Pickling is an acid treatment and preservation process for foods, usually either lactic acid produced by brining or vinegar added directly to the items preserved. Follow only proven recipes and techniques from reputable guides. Extension Services and Pickling and Canning books are good sources. Agaricus, especially the somewhat bland store bought varieties, Shiitakes, Oyster mushrooms, and firm puffballs all respond well to pickling.
Advantages - Marinated pickle broths give great flavors to mushrooms, taking bland varieties and giving them some excellent flavors. Great for parties, catered events, etc.. As antipastos and hors d?euvres etc. Relatively easy process to do at home
Disadvantages - Recipes must be proven and techniques adhered to rigidly. Not a good medium for experimentation on, as improper acid balance could lead to Botulism or other serious food poisoning. "
For dry boletes, here is a mushroom ketchup recipe.
While searching on the web, I also found this recipe for "Atjar Tumis Djamur Mushroom Pickles" The website is here .
From my pressure cooker instruction manual & recipe book they recomend the following about mushrooms (in general, no species indicated): Trim and soak in cold water 10 minutes. Wash. Cut large ones in half. cook gently 15 minutes. Pack hot and cover with boiling water. Leave 1/2 in. head space. Add salt (no quantity indicated).
Even found a good book.
Hehe I believe that pressure canning mushrooms would avoid bolutism (or whatever it's spelled) problems 
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