Subsequent authors added additional species to this mix, until Persoon revised Tremella in 1794 and 1801, repositioning the genus within the fungi.

has now been conserved under the International Code of Nomenclature for algae, fungi, and plants, with Tremella mesenterica as the type species.

[3] Molecular research, based on cladistic analysis of DNA sequences, has shown that Tremella (as previously understood) is polyphyletic (and hence artificial), with most species not closely related to the type.

In others they are much larger (up to 150 mm across) and may be variously lobed, cephaliform (like a brain, with folds and ridges), or foliose (with leaf-like or seaweed-like fronds).

[10] The basidia are "tremelloid" (globose to ellipsoid, sometimes stalked, and vertically or diagonally septate), giving rise to long, sinuous sterigmata or epibasidia on which the basidiospores are produced.

Hosts include members of the corticioid fungi and Dacrymycetales in the Basidiomycota and species of Diaporthe, other Sordariomycetes, and lichens in the Ascomycota.

The list below includes species of Tremella (in the wide sense) that have recently been described or redescribed based on fruit bodies.