Although Cladonia cinerella Ahti does not appear on the North American checklist of lichens and lichenicolous fungi, it was collected once from the Everglades of Florida in 1909. Ironically, I encountered a large colony deep within the interior of Everglades National Park exactly one century plus one day after the original encounter. In this paper I present some additional observations to Ahti's description based upon living Everglades material illustrated by photos and propose the addition of C. cinerella to the above checklist.