Soorten
Volgens Index Fungorum telt dit geslacht 46 soorten (peildatum november 2023):
| Soortnaam | Auteur(s) | Publicatiejaar |
| Geoglossum affine | (E.J. Durand) Sacc. & Traverso | 1910 |
| Geoglossum alpinum | Eckblad | 1963 |
| Geoglossum atropurpureum | (Batsch) Pers. | 1796 |
| Geoglossum barlae | Boud. | 1889 |
| Geoglossum berteroi | (Mont.) Colenso | 1887 |
| Geoglossum bhutanicum | Prasher & R. Sharma | 1997 |
| Geoglossum bogoriense | Henn. & E. Nyman | 1899 |
| Geoglossum brunneipes | Arauzo, Lebre & M. Becerra | 2014 |
| Geoglossum chamaecyparinum | Arauzo | 2014 |
| Geoglossum cohaerens | E.J. Durand | 1908 |
| Geoglossum cookeanum (Brede aardtong) | Nannf. ex Minter & P.F. Cannon | 2015 |
| Geoglossum difforme (Veelseptige aardtong) | Fr. | 1815 |
| Geoglossum dunense | Loizides, M. Carbone & P. Alvarado | 2015 |
| Geoglossum fallax (Fijngeschubde aardtong) | E.J. Durand | 1908 |
| Geoglossum geesterani | Arauzo & Lebre | 2014 |
| Geoglossum glabrum | Pers. | 1794 |
| Geoglossum hakelieri | Nitare | 1983 |
| Geoglossum hookeri | Cooke | 1875 |
| Geoglossum inflatum | (Mains) Arauzo | 2014 |
| Geoglossum japonicum | S. Imai | 1941 |
| Geoglossum jirinae | V. Kučera, Ševčíková & Slovák | 2020 |
| Geoglossum laccatum | W.Y. Zhuang | 1997 |
| Geoglossum lineare | Hakelier | 1967 |
| Geoglossum montanum | Nannf. | 1942 |
| Geoglossum muelleri | Berk. ex Cooke | 1875 |
| Geoglossum nigritum | (Pers.) Cooke | 1878 |
| Geoglossum noumeanum | Har. & Pat. | 1903 |
| Geoglossum paludosum | (Pers.) E.J. Durand | 1908 |
| Geoglossum peckianum | Cooke | 1875 |
| Geoglossum pusillum | F.L. Tai | 1944 |
| Geoglossum pygmaeum | W.R. Gerard | 1908 |
| Geoglossum raitviirii | Fedosova & E.S. Popov | 2016 |
| Geoglossum scabripes | P. Iglesias & Arauzo | 2014 |
| Geoglossum simile (Langstelige aardtong) | Peck | 1873 |
| Geoglossum sinense | F.L. Tai | 1979 |
| Geoglossum spathulatum | Massee | 1908 |
| Geoglossum starbaeckii | Nannf. | 1942 |
| Geoglossum thymiphilum | Velen. | 1934 |
| Geoglossum tropicale | Raitv., K.S. Thind & R. Sharma | 1985 |
| Geoglossum tubaraoense | Henn. | 1900 |
| Geoglossum uliginosum | Hakelier | 1967 |
| Geoglossum umbratile (Slanke aardtong) | Sacc. | 1878 |
| Geoglossum variabilisporum | Arauzo | 2014 |
| Geoglossum viscosum | Pers. | 1797 |
| Geoglossum vleugelianum | Nannf. | 1942 |
| Geoglossum xylarioides | Rehm | 1896 |
Bronnen, noten en/of referenties