The most common white cell found in the granulocytic series is the neutrophil.

Here's why:

* Granulocytes: These are white blood cells that contain granules in their cytoplasm. They are part of the innate immune system and are crucial for fighting off infections.

* Neutrophils: They are the most abundant type of granulocyte, making up around 50-70% of all white blood cells in the body.

Let me know if you have any other questions about blood cells!