Chaetocladus

Chaetocladus is a non-calcifying genus of unicellular green algae known from the Upper Silurian.
Morphology.
"Chaetocladus" thalli range from 2–6 cm in height and average 1 cm in diameter. They comprise a parallel-sided, unbranching axis which is surrounded by leaf-like ramifications.
Fossil record.
"Chaetocladus" is known from upper Silurian konservat l\agerstätte, and found in association with other algae, arthropods, and annelid worms.
Similar Dasycladean algae are reported from late-Ordovician lagerstatte.
Classification.
Due to its morphological similarity to the extant order Dasycladales, "Chaetocladus" is considered to be an early cousin of this order. Unlike the majority of Dasycladales, "Chaetocladus" does not form deposit calcite - therefore it required much rarer taphonomic conditions to be preserved.
Some genera now recognised as "Chaetocladus" were originally described as Graptolites.