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Agaricus bisporus gills small

(NOTE: If you are not interested in growing this mushroom, but learning how to find it in the wild and identify it, try going to the Nature's Restaurant Online site for the Common Mushroom.)

Common Mushroom (Agaricus bisporus). There are a few other common names the Common Mushroom has: Button mushroom, Portobello, Portabella, Portabello, White mushroom, Table mushroom, Cultivated mushroom, Champignon mushroom, Cremini/Crimini mushroom, Brown cap mushrooms, Italian mushroom, Italian brown, Roman brown mushroom, Swiss brown mushroom, chestnut mushroom, Portabellini, Baby Portobello, Baby Bella and Mini Bella. It also has two other Latin names: the Agaricus brunnescens, and for the white version only, the Agaricus hortensis.

Now, I know a lot of people will wonder how the "Button mushroom" you buy in a store could be the exact same mushroom as the Portobello. For one thing, the Button mushroom is picked at a very immature stage of the mushroom's cycle - known as the button stage, hence the name "Button mushroom". The Portobello is picked when the mushroom is at the fully mature stage. The color difference on the cap (white or brown) is just due to variations within the species. In the wild, you are far, far more likely to find the brown cap variety. The white ones you buy in a store all came from a source of white ones found by accident many decades ago.

This mushroom is a good place to start. You get results fast with kits, the fruitings come up many times, and most people know what they look like and how to use them. Read up on how to grow these mushrooms if you want to try it outside.

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Agaricus bisporus

Agaricus bisporus. Cap is convex to flat. The gills are free (don't touch the stem). Often there is a ring on the stem a little down the stem under the gills, and you can see it clearly here.

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Important Notes when Identifying
Some Cautions
Dangerous Plants to Avoid Touching

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