Tremella mesenterica Retzius Vet.
Basidia longitudinally septate.
Habitat Gregarious on wood, where it is parasitic on Stereum species. Edibility Edible, but without flavor. Comments Tremella mesenterica or Witches Butter is the name assigned to most collections of yellowish-orange jelly fungi in the S.F. Bay Area. Dacrymyces palmatus , however is very similar and the two species cannot be reliably told apart without the use of a microscope. Tremella mesenterica has longitudinally septate basidium while the basidium in Dacrymyces palmatus resembles a tuning fork.