Many of the Natural Fuels Photo Series were created prior to the development of the Fuel Characteristic Classification System (FCCS).   Although some of the terms differ between the FCCS and photo series, you can enter photo series data into the FCCS.

The following table provides a crosswalk from the photo series to the FCCS:
 

Natural Fuels Photo Series FCCS Fuel Category Stratum Category or Categories Saplings and Trees Canopy Trees, Snags Shrubs (Understory vegetation) Shrub Primary and secondary layers Graminoids and Forbs (Understory vegetation) Nonwoody Fuels Primary and secondary layers Woody materials Woody Fuels Sound and rotten wood Forest floor - litter or surface material Litter-Lichen-Moss Litter Forest floor - lichen Litter-Lichen-Moss Lichen Forest floor - cryptograms Litter-Lichen-Moss Moss Forest floor - duff Ground Fuels Duff

Tip:  several fuel categories in the FCCS are not included in the photo series, including stumps, piles (woody fuel accumulations), squirrel middens, and basal accumulations.  If your fuel type has any of these categories, you will need to make independent measurements to collect these data.