| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Tichowtungiales | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Tichowtungiia | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Tigrinifilum | Unknown | Valid (ICNafp) | Excubia bot 9 months ago | |
| Tigrinifilum floridanum T | Unknown | Valid (ICNafp) | Excubia bot 9 months ago | |
| Tigrinifilum guerandense | Unknown | Valid (ICNafp) | Excubia bot 9 months ago | |
| Tildeniella | Unknown | Valid (ICNafp) | Excubia bot 9 months ago | |
| Tildeniella alaskaensis | Unknown | Valid (ICNafp) | Excubia bot 9 months ago | |
| Tildeniella nuda | Unknown | Valid (ICNafp) | Excubia bot 9 months ago | |
| Tildeniella torsiva T | Unknown | Valid (ICNafp) | Excubia bot 9 months ago | |
| Timaviella | Unknown | Valid (ICNafp) | Excubia bot 9 months ago | |
| Timaviella circinata T | Unknown | Valid (ICNafp) | Excubia bot 9 months ago | |
| Timaviella dunensis | Unknown | Valid (ICNafp) | Excubia bot 9 months ago | |
| Timaviella edaphica | Unknown | Valid (ICNafp) | Excubia bot 9 months ago | |
| Timaviella karstica | Unknown | Valid (ICNafp) | Excubia bot 9 months ago | |
| Timaviella obliquedivisa | Unknown | Valid (ICNafp) | Excubia bot 9 months ago | |
| Timaviella radians | Unknown | Valid (ICNafp) | Excubia bot 9 months ago | |
| Timonella | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Timonella senegalensis T | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Tindallia | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Tindallia californiensis | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Tindalliaceae | ||||
| Tindallia magadiensis T | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Tindallia magadii | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Tindallia texcoconensis | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Tissierella | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Tissierella carlieri | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Tissierellaceae | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Tissierella creatinini | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Tissierella creatinophila | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Tissierellales | Unknown | Valid (ICNP) | Excubia bot about 3 years ago |