By the way, the upfacing light orange lily in that thread (#4 of the six photos) came from my seed of
Lilium 'Prawn Tiger' x
L.ilium maculatum var.
wilsonii. That particular cross turned out to be terrible marriage. Your flower looks pretty nice, but most seedlings I grew produced homely flowers. The bulbs tasted good though!
do you think my white L. martagon plant could proceed from the 'Claude Shride' seeds you sent me?
--- Since there is only one, it's possible. But it would be a very unusual occurrence, so consider yourself lucky!
do you think my L. martagon would benefit from acid soil?
--- No. Martagons are very adaptive to soil pH. They will grow in acid or alkaline soils.