V speleološki zbirki so najlepši kapniki iz zbirke Franca Hohenwarta iz začetka 18. stoletja, ki jih je društvu odstopil prirodoslovni muzej v Ljubljani. Zbirka predstavlja skoraj vse oblike kapnikov in sige, ki obstajajo v slovenskih jamah in se ločijo po načinu nastanka.

The Hohenwart collection of the speleothems
In the speleological collection are the most beautifool stalagmites and stalactites from the Franc Hohenwart collection from the beginning of the 18. century, which were given to speleological society by the natural museum in Ljubljana. Collection represents almost all forms of the stalagmites and stalactites and flowstone that exists in caves and differ by their origin.