John I have a very convincing looking C. rivulosa with faint concentric rings on the cap so i will enter that.
The grey specimen with the depressed centre I think you have it right as C. barbularum. Everything fits perfectly so I will enter that also.
A third white species that I also collected I think is C. candicans although I must admit I have only ever seen it in woodland.
Does your Clitocybe fragrans still hold good or is this No 3?
Cheers
Doug.