Saturday, January 24, 2009

On portobellos, crimini, and button mushrooms

In an item that recently came into my inbox, the author states that the crimini is the 'little brother' of the portobello. Actually, the relationship is not filial, it's identical. Crimini, portobello, and common button mushrooms as well (the most commonly consumed kind in the US) are all Agaricus bisporus (J.E. Lange) Imbach. Crimini are small portobellos, buttons are immature crimini, and portobellos are the larger, more mature version of buttons and crimini. The difference is in the size.

These saprobic mushrooms do grow in the wilds of Europe and North America, commonly in grassy areas, and while button mushrooms may have gills that appear pinkish or white, they actually have a dark brown spore print at maturity. There are several species of Agaricus that share this niche, and some are edible, even choice (no surprise there), while others are 'poisonous to some individuals', or just plain poisonous. Some have interesting aromas, like anise, almond, phenol, bleach, or 'fungal', and the staining reaction (color changes when cut or bruised) and skirt (partial veil) characteristics are also important for identification. As always, don't eat anything if you're not SURE you know what it is.

The species epithet 'bisporus' comes from the two-spored basidia. Four is the most common number of spores/basidium in the holobasidiomycetes including most mushrooms.

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