Brazil-British Guyana boundary: Akarai Mountains, on height of land between drainage of Rio Mapuera (Trombetas tributary) and Shodikar Creek (Essequibo tributary)
Region upper Demerara Berbice, Mabura Hill, 230 km. sud de Georgetown, Demerara Timbers Ltd. forest concession, Black Water Creek, près de la pompe d'alimentation en eau
Kaieteur Plateau : Infrequent epiphyte at upper margins of deep crevices at edge of escarpment near Johnson's View. Vicinity of Kaieteur Falls and along western rim of Potaro Gorge