Final answer:
Monocytes are the atypical lymphocytes seen in patients with infectious mononucleosis.
Step-by-step explanation:
Monocytes are the atypical lymphocytes seen on the peripheral blood smear of patients with infectious mononucleosis.
Monocytes are a type of white blood cell that play a role in the immune response. In infectious mononucleosis, monocytes can appear larger and have more abundant cytoplasm compared to normal monocytes.