Oreocereus trollii
- Photographs and information on the Old Man of the Mountain.
- http://www.desert-tropicals.com/Plants/Cactaceae/Oreocereus_trollii.html

Oreocereus pseudofossulatus
- Information on this species and a photograph.
- http://www.desert-tropicals.com/Plants/Cactaceae/Oreocereus_fossulatus.html

Oreocereus leucotrichus
- Information and several photographs of this species.
- http://www.desert-tropicals.com/Plants/Cactaceae/Oreocereus_leucotrichus.html

Oreocereus hempelianus
- Information and photographs of this species.
- http://www.desert-tropicals.com/Plants/Cactaceae/Oreocereus_hempelianus.html

Oreocereus doelzianus
- Information and photographs of this species.
- http://www.desert-tropicals.com/Plants/Cactaceae/Borzicactus_doelzianus.html

Oreocereus celsianus
- Photographs and a drawing of the Old Man of the Andes, with information on the cactus.
- http://www.desert-tropicals.com/Plants/Cactaceae/Oreocereus_celsianus.html

Oreocereus
- Images of seven species.
- http://www.desert-tropicals.com/Plants/Cactaceae/Oreocereus.html

Oreocereus fossulatus
- image
- http://www.dipbot.unict.it/orto/0988-1.html