With few exceptions, lumber species or lumber species combination (usually in abbreviated form) is a standard component of lumber grade stamps per the American Lumber Softwood Lumber Standard – PS20.
These grade mark components are illustrated below for Visually Graded Lumber.
An example grade stamp for S-P-F (or Spruce-Pine-Fir) lumber species combination is shown below:
If lumber species or lumber species combinations questions arise based on grade stamp notations, the inspection agency for this example (i.e., Pacific Lumber Inspection Bureau) should be contacted:
See (http://alsc.org/uploaded/LumberProgram_facsimile%20September%202021.pdf) for more information on grade stamps including inspection agency contact information.