| Name | From | To | Age range |
|---|---|---|---|
| Gleichenia conspiqua | Paleocene | Early Eocene |
|
| Gleichenia conspicienda | Late Jurassic | Middle Albian |
|
| Gleichenia conflexa | Jurassic | Paleocene |
|
| Gleichenia concavisporites | Late Jurassic | Tertiary |
|
| Gleichenia concava | Early Oxfordian | Miocene |
|
| Gleichenia communa | Bajocian | Miocene |
|
| Gleichenia circinnata | Early Cretaceous | Middle Oligocene |
|
| Gleichenia circinidites | Jurassic | Late Neogene |
|
| Gleichenia circinata | Cretaceous | Recent |
|
| Gleichenia carinatus | Aptian | Aptian |
|
| Gleichenia carinata | Late Jurassic | Late Eocene |
|
| Gleichenia borealis | Liassic | Albian |
|
| Gleichenia angulata | Early Gothlandian | Late Neogene |
|
| Gleichenia alpina | Nd | Nd |
|
| Gleichenia aculiidenosporites | Early Cretaceous | Tertiary |
|
| Gleichenia abnormis | Early Oxfordian | Early Albian |
|
| Gleichenia | Namurian | Recent |
|