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Edible mushrooms

Among the thousand genera of available fungi, only a handful of them can be cultivated as edible mushrooms. But before that, let us first learn what mushrooms actually are?

In simplistic terms, mushrooms are multi-cellular fungi. For a biologist, they actually are soft, fleshy extensions of hyphae or mycelia appearing above the ground.

Edible mushrooms
Edible mushrooms. Photo courtesy: Gary Stevens

Among the living organisms, they are classified into the separate kingdoms of fungi, distinct from plants and animals. Mushrooms lack chlorophyll, and therefore, cannot synthesize their own food, which forces them to survive on readymade organic matter for growth.

Mushrooms come in many different shapes and appearances. In general, they feature a cap and a stalk and are frequently discovered on organic manure, wood, humus, or any rotting matter. Lack of chlorophyll pigment makes them appear in colors other than green; usually in white, brown, brown, and dark (truffles).

Edible Mushrooms

Among thousands of mushroom varieties, only a few hundred can be worth exploring for consumption safely. In general, an edible mushroom can be domestic or wild.

Domestic mushrooms are the ones grown under supervised farming and marketed through authentic retailers. Wild mushrooms are found in the forests and fields. They, in general, are foraged in the wild, and maybe limited for self-use or for sharing among friends, and relatives.

Classification of edible mushrooms

Edible fungi occur in two major taxonomic groups.

  1. The basidiomycetes include the mushrooms, shelf (bracket) fungi, and bolete;

  2. The ascomycetes include truffles and morels.

Here is an impressive list of edible mushrooms with detailed illustrations of their health benefits and nutrition facts:
White button mushrooms
White button
boetus edulis
Bolete (porcini)
enoki mushroom
Enoki mushroom
hen of the woods mushroom
oyster mushroom
Oyster mushroom
shiitake mushroom
Black truffle

Mushroom nutrition

  • Mushrooms endowed with natural proteins, ample amount of vitamins, minerals, and antioxidants.

  • They contain vitamin B-12 in sufficient quantities which otherwise lacking in any plant produces.

  • Despite of their high quality nutritional composition, they relatively low in calories, and fats and contain zero cholesterol.

  • Additionally, mushrooms carry natural anti-oxidants such as ergothinene, phenolic pigments etc.

  • They indeed are excellent sources of essential minerals like manganese, selenium, zinc, copper, iodine, and molybdenum.

  • Furthermore, mushrooms are modest sources of vitamin-D (ergo-calciferol). Vitamin D plays a vital role in the calcium and phosphate metabolism.

Selection of mushrooms

While the wild mushroom collection is a specialist's job, cultivated mushrooms can be picked up by anyone and can be easily available for most of the season in the grocery stores. Choose fresh-looking, firm ones. Avoid dry, discolored, shriveled mushrooms as they indicate signs of decaying and hence, out of flavor. In the supermarkets, they generally available in polythene sheeted packs, canned, etc.

Mushrooms are highly perishable. Handle them with care. Once at home, use them as early as possible. If at all to be stored for later use, do not unseal the pack and keep it as it is inside the refrigerator set at 0-2 degrees. Keep unpacked, loose mushrooms inside a paper pack to absorb moisture and place them inside the refrigerator for short-term use. Mushrooms can be dried and kept for up to one year.

How to use edible mushrooms?

Clean mushrooms that you intended to use in cooking. To clean, just brush them using a soft cloth or brush to remove tiny peats on their surface. If at all to wash, do so briefly under running water or in slightly vinegary water. Do not allow them to soak and damp. Dry by using a soft towel. Do not peel. Trim any dry, tough end of the stem.

Peeling mushrooms, like vegetables, is unnecessary as this involves loss of flavor and nutritional value. The stem (or "foot") of the mushroom is usually edible. Some species have a tough and fibrous stem that needs to be removed. In other cases, simply cut off the base of the stem if it is dry or has traces of soil.

Tips for cooking mushrooms

  1. Cook mushrooms in stainless steel, glass, cast iron or terra-cotta pots to avoid their browning.

  2. Add salt at the end of cooking to prevent them shrink due to draining out water.

  3. To get maximum flavor, it is best to add mushrooms at the end of cooking to dishes that require prolonged simmering.

  4. Freezing affects their texture and reduces their flavor.

Toxicity-Poisonous mushrooms

While large numbers of mushrooms are simply inedible, the number of poisonous/lethal mushrooms is relatively small. Many of these gathered mistakenly while foraging for wild edible mushrooms in the forests and fields. There are no consistent features or definitive tests that distinguish edible mushrooms from poisonous varieties. The only reliable guide to edibility is the knowledge that someone has eaten a particular type and survived. An expert having clear knowledge of poisonous mushrooms can identify and distinguish them from edible wild mushrooms.

Some of the notable poisonous species are Amanita phalloides, which is the major cause of deaths around the world from mushroom consumption. Without being poisonous, several varieties can cause illness, stomach ache, and vomiting. Therefore, it is important to know the exact type and edibility of any mushroom before consuming it. (Medical disclaimer).

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Further reading and Resources:

  1. Selenium in edible mushrooms.

  2. Stanford School of Medicine Cancer information Page- Nutrition to Reduce Cancer Risk. (Link opens in new window).

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