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Author - title
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| details | Nd | North America | Hoffmeister,W.S. et al. Additions and corrections to "Geologic range of Paleozoic plant spores in North America". | 1955 | |
| details | Middle Chesterian | Late Chesterian | North America | Hoffmeister,W.S. et al. Geologic range of Paleozoic plant spores in North America | 1955 |
| original | Chesterian | Kentucky | Hoffmeister,W.S. et al. Mississippian plant spores from the Hardinsburg Formation of Illinois and Kentucky. | 1955 |