A hybrid created by Captain Jessop.
Parentage : Pachyphytum oviferum x P. viride.
Steven Thompson kindly shared the following facts :
"It is from a deliberate cross made and raised by the late Captain Jessop between P. oviferum and P. viride. He was a founder member (in 1946) of the Sheffield, England branch of the National Cactus and Succulent Society. He had held the rank of Captain in the British army in the Second World War. He had an interest in hybridising plants.
In 1978 he was living in the village of Great Longstone in the Peak District of Derbyshire. Brian and Gillian Fearn of Abbey Brook Cactus Nursery, Matlock, Derbyshire visited him at his home in that year. He gave them this plant (and also a hybrid of Chamaecereus and a Lobivia). Brian and Gillian named them both after Captain Jessop and introduced them to wider cultivation through their nursery.
I received the information about the plant from them and the information about the man from the late Derek Glossop of the Sheffield branch.
I notice that the tips of the sepals of Pachyphytum ‘Captain Jessop’ are pointed as are those of P. oviferum. Those of bracteosum and viride are rounded so I think this is further evidence that its parents are P. oviferum and P. viride."