| Synonym/Old Name | New Name | Taxonomy Group | ||
|---|---|---|---|---|
 | Chroomonas salina | Rhodomonas salina | Cryptophyceae | more info |
 | Chrysochromulina ericina | Haptolina brevifila | Coccolithophyceae | more info |
 | Chrysochromulina polylepis | Prymnesium polylepis | Coccolithophyceae | more info |
 | Chrysotila lamellosa | Ruttnera lamellosa | Coccolithophyceae | more info |
 | Chrysymenia enteromorpha | Botryocladia enteromorpha | Rhodophyta | more info |
 | Cladophora affinis | Cladophora laetevirens | Chladophora | more info |
 | Cladophora pulverulenta | Cladophora vagabunda | Chlorophyta | more info |
 | Cladophora rupestris | Rama rupestris | Chlorophyta | more info |
 | Cladophora utriculosa var. laetevirens | Cladophora laetevirens | Chlorophyta | more info |
 | Cladostephus densus | Cladostephus spongiosus | Phaeophyceae | more info |
 | Coccomyxa dispar | Coccomyxa confluens | Trebouxiophyceae | more info |
 | Coccomyxa simplex | Pseudococcomyxa simplex | Trebouxiophyceae | more info |
 | Codium dichotomum | Codium tomentosum | Chlorophyta | more info |
 | Codium divaricatum var. inflectum | Codium cylindricum | Chlorophyta | more info |
 | Codium fragile subsp.fragile | Codium fragile | Chlorophyta | more info |
 | Codium tomentosum var. elongatum | Codium decorticatum | Chlorophyta | more info |
 | Codium tomentosum var. tenue | Codium tenue | Chlorophyta | more info |
 | Colpomenia sinuosa var. peregrina | Colpomenia peregrina | Phaeophyceae | more info |
 | Conferva antennina | Chaetomorpha antennina | Chlorophyta | more info |
 | Conferva flacca | Ulothrix flacca | Chlorophyta | more info |
Credits to Prof Leonel Pereira
