Here’s a picture where you can see the tree hole it was in.
From the Wikipedia:
Dryad's saddle is an annual mushroom commonly found attached to dead logs and stumps or on living hardwood trees at one point with a thick stem. Generally, the fruit body is round and between 8–30 centimetres (3–12 inches) acros – exceptionally 60 cm (24 in) – and up to 10 cm (4 in) thick. The body can be yellow to brown and has "squamules" or scales on its upper side. On the underside one can see the pores that are characteristic of the genus Cerioporus; they are made up of tubes packed together closely.
It was high up so I couldn’t see the "squamules".
Here, these come up just before morels in the spring, and taste slightly of citrus. We love them, as they are usually the first thing we find after winter. They pop up again at this time but there are usually a lot more choice mushrooms this time of year, so we don't actively seek them like we do early.
Yeah, the Wikipedia said they smelled like watermelon rind. I unfortunately cannot confirm, because I didn’t think to smell it.