The arboreomorphs (Arboreomorpha) are

ediacaran The Ediacaran ( ) is a geological period of the Neoproterozoic geologic era, Era that spans 96 million years from the end of the Cryogenian Period at 635 Million years ago, Mya to the beginning of the Cambrian Period at 538.8 Mya. It is the last ...

organisms of the

frondomorph The petalonamids (Petalonamae) are an extinct group of archaic animals typical of the Ediacaran biota, also called frondomorphs, dating from approximately 635 million years ago to 516 million years ago. They are benthic and motionless animals, t ...

type that had a disk or bulb-shaped anchor on the ocean floor, a central stem and branching. The "branches" were smooth, tubular structures, often swollen with bifurcation and connected together to form a leaf-like structure.Marc Laflamme & Guy M. Narbonne (2008): Competition in a Precambrian world: palaeoecology of Ediacaran fronds. Geology Today Vol. 24, No. 5: 182-187. It was previously included within

Rangeomorpha The rangeomorphs are a group of Ediacaran fossils. Ediacarans are the oldest large fossil organisms on earth, and many are not self-evidently related to anything else that has ever lived. However, some Ediacarans clearly resemble each other. Pale ...

, but later removed when more related forms were found.

References

Petalonamae Ediacaran life Prehistoric marine animals {{Ediacaran-stub