I think you may be right. But looking at Kuo's page along with the photos he has up almost convinced me otherwise. He lists the caps as 3 to 10 cm in width, when most of the caos I saw were under 3cm. Plus the photos appear to show some of the caps as fairly thick, compared to the very thin caps I'd found. I want to say only a couple of mm at most, but this really highlights my need for a more accurate metric ruler...

But the algae thing seemed spot on, and many of the characterisics seemed to match - then I checked out Messiah College's page on the species, and they extend the cap range from .5 to 10, and have pictures which are pretty much totally identical to what I saw.

However, to devils advocate for T.villosa, Kuo indicates the pores go from white to "a little brown", and the photos he has up do show a hint of green, as do some other dubiously sourced photos on the internet. Also the description of the flesh being "insubstantial" better aligns with the mushrooms I found.

In all, I'm honestly not sure. But I feel like based on the descriptions I've seen, they are both strong contenders, so I'm definitely adding Cerrena unicolor to the title.

Involvement like this is why I really like the "random finds" posts. :)