Suillus cavipes has been observed in western North America (on at least Larix occidentalis), eastern North America (on Larix laricina) and central Europe (on Larix decidua). It is also known from Britain and Ireland, presumably on cultivated larch specimens and plantations.
The “hollow” part of the common name is one of its distinguishing features, shown in one of the photographer’s recent images of the species: hollow stipe of Suillus cavipes (also see Pieter’s other images from the same set: underside of cap and top of cap). For perspective, the caps can be 5-8cm (to 3in.) in diameter.