U.S. Code of Federal Regulations
Regulations most recently checked for updates: Sep 27, 2023
The cell development of a leaf as indicated by its porosity. The degrees range from close (slick and tight) to open (porous). (See chart.)
Regulations most recently checked for updates: Sep 27, 2023
The cell development of a leaf as indicated by its porosity. The degrees range from close (slick and tight) to open (porous). (See chart.)