This document discusses different types of biofuels produced from lignocellulose, including directly-fermented cellulosic biofuels and cellulosic ethanol. Directly-fermented cellulosic biofuels are produced from lignocellulose feedstocks like corn stover and switchgrass through cellulolysis or gasification processes followed by fermentation and distillation to produce ethanol. Cellulosic ethanol specifically involves using enzymes to break down lignocellulose into simple sugars like glucose, fermenting the sugars into ethanol, and distilling the ethanol.