| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Chondrocystis schauinslandii T | ||||
| Chroococcaceae | ||||
| Chroococcales | ||||
| Chroococcidiopsidaceae | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Chroococcidiopsidales | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Chroococcidiopsis | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Chroococcidiopsis bourrellyana | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Chroococcidiopsis cubana | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Chroococcidiopsis lichenoides | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Chroococcidiopsis muralis | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Chroococcidiopsis thermalis T | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Chroococcophyceae | ||||
| Chroococcus | ||||
| Chroococcus rufescens T | ||||
| Chrysosporum | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Chrysosporum bergii T | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Coelomoron | Hoffmann et al., 2005 and Strunecký et al., 2023 | Valid (ICNafp) | Rodriguez-R, Luis M over 2 years ago | |
| Coelomoron regulare T | ||||
| Coelosphaeriaceae | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Coelosphaeriopsis | Hoffmann et al., 2005 and Strunecký et al., 2023 | Valid (ICNafp) | Rodriguez-R, Luis M over 2 years ago | |
| Coelosphaeriopsis halophila T | ||||
| Coelosphaerium | Hoffmann et al., 2005 and Strunecký et al., 2023 | Valid (ICNafp) | Rodriguez-R, Luis M over 2 years ago | |
| Coelosphaerium kuetzingianum T | ||||
| Coleodesmium | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Coleodesmium wrangelii T | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Coleofasciculaceae | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Coleofasciculales | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Coleofasciculus | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Coleofasciculus chthonoplastes T | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago | |
| Compactonostoc | Unknown | Valid (ICNafp) | Excubia bot over 2 years ago |