Updated November 02, 2016. Definition: The alien registration number or A-number is an identifying number that USCIS assigns to certain aliens, such as those who apply for adjustment of status. A-numbers may consist of 8 or 9 digits. The A-number is yours for life, much like a social security number.
Turkey tail mushrooms growing on a log in the old growth forest. They are commonly called turkey tail because their various colors: brown, orange, maroon, blue and green -- reminiscent of the plume of feathers in turkeys. In China, their common name is yun zhi.
Oyster mushrooms (Pleurotus ostreatus) grow on birch trees. The mushrooms look like groups of shelves, have smooth uppers with gilled stalks, and measure 2 to 8 inches in width, according to the University of California IPM Online. Mushrooms appear in a variety of colors including white, cream, gray, brown, and lilac.yster mushrooms (Pleurotus ostreatus) grow on birch trees. The mushrooms look like groups of shelves, have smooth uppers with gilled stalks, and measure 2 to 8 inches in width, according to the University of California IPM Online. Mushrooms appear in a variety of colors including white, cream, gray, brown, and lilac.