I’m not 100% sure of this i.d. For a while I thought it was Clavulina cristata (white coral fungus) but that fungus to me has really wavy “arms” whereas the photos below the “arms” are straight vertical. There a lot of similar species, so I could be wrong about this one.
Size: Up to 10cm tall Family: Gomphaceae Habitat: Grows on dead wood, stumps, trunks and branches of deciduous and coniferous trees. Identifiers: Multiple slender, compact and vertical parallel branches. Color, dark cream/light tan to brownish.