Bracket or tooth?

Another fungus has me "stumped"! This delicate-looking cream fungus is on the branches of a dead sapling. From above, it looks like a bracket fungus, but underneath it is toothed. Does anyone have a clue what it is?

Looks like a bracket forming polypore, with elongate pores.

Thanks! Now that I have a starting point, I'll go back to my reference book and work through the list of brackets. If I pin down the species, I'll post again!