Is Cottonwood toxic?

[JaceW/Lifer-Log]

I’m harvesting leaf litter from my backyard and most leaves are cottonwood. Is this safe for salamanders? Can Isopods eat it? Pretty much, is Cottonwood known to be toxic?

Also, I gathered rotting wood for my Isopods, I know you want herdeood leave but the actual wood be softwood? This question is less Inportant than the first but an answer would still be appreciated!

P.S. Sorry this isn’t exactly about newts and sals.