I noticed this spider while walking in the park. I've gone back to take pictures three or four times and she's always been in the same spot. From googling around I think it must be dolomedes albineus or tenebrosus. Living in a tree makes me think it must be d. albineus, but there was water in the bottom of its treehole (it has been pretty rainy the last week), and it really looks close to some of the d. tenebrosus photos I've seen.