| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Acaryochloridaceae | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Acaryochloridales | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Acaryochloris | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Acaryochloris marina T | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Achroonema | ||||
| Achroonema angustum | ||||
| Achroonema spiroideum T | ||||
| Aegeococcaceae | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Aegeococcales | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Aegeococcus | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Aegeococcus anagnostidisii T | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Aegeococcus thuretii | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Aerofilum | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Aerofilum fasciculatum T | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Aerosakkonema | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Aerosakkonema funiforme T | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Aerosakkonemataceae | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Aerosakkonematales | ||||
| Aetokthonos | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Aetokthonos hydrillicola T | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Affixifilum | ||||
| Affixifilum floridanum T | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Affixifilum granulosum | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Ahomia | ||||
| Ahomia kamrupensis T | ||||
| Ahomia purpurea | ||||
| Ahomia soli | ||||
| Ahomia thailandica | ||||
| Albertania | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Albertania alaskaensis | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago |