The stages of taxonomic expertise, with respect to a taxon.
1) They all look the same.
2) You can tell that there is variation but you can't break it up into distinct taxa. (You might be able to identify a few distinctive forms.) That's where I am with bryophytes.
3) You can recognise the common taxa. (Rare taxa may be misrecorded as common taxa. In my case I spent a few years overrecording Brassica napus.)
4) You can recognise and see variation in the common taxa; variants of common taxa are misrecorded as rare taxa.
5) True expertise.