The eryngii is sometimes also referred to as the king oyster mushroom. It’s the largest variant of the oyster mushrooms, with a velvety, light grey-brown hat which stands on top of a strong white stalk. The eryngii has a relatively small hat, measuring 3 to 10 cm in width, when compared to other oyster mushrooms. The king oyster mushroom gives off an almond smell and has a shell-like flavour. It’s a very healthy mushroom: the eryngii contains plenty of vitamins and minerals.