There are around 7 species of Coleosporium (mainly host-specific) which are shown as valid taxa on the NBN Atlas, but which can't be entered on irecord as they are regarded as synonyms of Coleosporium tussilaginis. I don't know why there is a discrepancy between the 2 systems both based on the UKSI.
Comments
Still awaiting an update
The NBN Atlas has been updated with recent UKSI changes, but iRecord doesn't appear to have had the species dictionary updated for some time. I assume there is atechnical reason why it hasn't happened, but I find it frustrating too so hopefully getting it sorted so we can record recent additions to the British list, recent splits and use the most uptodate taxonomy is a priority.