Ptilothamnion speluncarum
- kingdom: Plantae
- phylum: Rhodophyta
- class: Florideophyceae
- order: Ceramiales
- family: Wrangeliaceae
- genus: Ptilothamnion
- species: Ptilothamnion speluncarum
Duncan Town
Ragged Island
Bahamas
Cidade Velha
Ribeira Grande de Santiago
Cape Verde