Thanks Cambridgelad and Hubertg. I’ve reassigned the photo out of Jean Sisley (hybrid tea, Bennett, 1879). and into Mme. Jean Sisley (china, Dubreuil 1885)
according to rudolf geschwind -die theerose und ihre bastarde, leipzig 1884 - the elders of jean sisley are president (william paul 1861) x emile hausbourg
Thank you for the reference, which we added. There are differing opinions on the question whether the 'President' by Paul is a new cultivar, or only a synonym for 'Adam'. The references on this subject are contradictory.