Thelocactus hexaedrophorus var. fossulatus (Scheidw.) Backeb.
, Cactaceae (Backeberg) 5: 2800 (1961).
External links to taxonomic opinions:
- IPNI Life Sciences Identifier (LSID)
- urn:lsid:ipni.org:names:251033-2
- Publication
- Die Cactaceae: Handbuch der Kakteenkunde
- Collation
- 5: 2800
- Family as entered in IPNI
- Cactaceae