Step 1: In Principles of Animal Ecology (1949), Allee and coworkers listed major terrestrial biomes of the world such as tundra, taiga (boreal coniferous forest), temperate deciduous forest, grassland, desert, and tropical forest types.
Step 2: Tundra, taiga and grassland are all explicitly named biomes in this classification.
Step 3: Woodland is a looser, informal term for tree-covered land and is not one of the distinct named biomes in Allee's scheme, so it is the one not mentioned.