Oreocereus fossulatus - image Oreocereus - Images of seven species. Oreocereus celsianus - Photographs and a drawing of the Old Man of the Andes, with information on the cactus. Oreocereus doelzianus - Information and photographs of this species. Oreocereus hempelianus - Information and photographs of this species. Oreocereus leucotrichus - Information and several photographs of this species. Oreocereus pseudofossulatus - Information on this species and a photograph. Oreocereus trollii - Photographs and information on the Old Man of the Mountain.