Gordoniella
(tree size 1)
Hommersandiella
(tree size 1)
Interthamnion
(tree size 1)
Lomathamnion
(tree size 2)
Ptilothamnionopsis
(tree size 1)
Rhipidothamnion
(tree size 1)
Spermothamnion
(tree size 42)
Stegengaea
(tree size 1)
Woelkerlingia
(tree size 2)
Tiffaniella
(tree size 13)