Beautiful, deeply wrinkled gills. Small, about 2.5 cm or less
On dead twigs of salmonberry bushes in a shady area
I'm not sure if Tetrapyrgos subdendrophora or Marasmiellus subdendrophora is correct. In the mushroom ID forum, most people said Marasmiellus subdendrophora. However, online all the sources that show up say Tetrapyrgos subdendrophora. I think it may have been a recent name change.