David said,
“It is really fascinating to wonder if the striping in modern roses derrived from ‘Ferdinand Pichard’ is because the virus or retrotransposon integrated within an anthocyanin gene and became a heritable form of striping unlike it seems the striping in other old roses that doesn’t seem to be heritable.”
FYI, striping present in ‘Commandant Beaurepaire’ is also heritable. There are striped descendants being evaluated now.
‘Ferdinand Pichard’ is not the only source of genetic striping in old garden roses, though it is the only source presently represented in modern roses.