I've experienced bullying by a female boss, she was vicious in the extreme. Mindgames, physical intimidation, shouting and screaming. The whole works.
However, on the flip side I also had a fantastic female boss who was sometimes accused of being a bully or being horrible and she was nothing of the sort. She did however behave in ways that would probably be seen as more typically male. I felt very sorry for her, because she was perfectly fair and reasonable, but she just was very forthright about what she expected.
The best bosses I have ever have had also been women.