For the past few years, since retiring from the YNU Executive in 2011, I have been involved with Nature Conservation Assessments for the National Trust both in Dorset where I live and occasionally in Yorkshire where I spent my working life.A conundrum occurred whilst surveying Hudswell Wood, Richmond, in 2013-14. In Billy Bank Wood there is an extensive stand of Mountain Currant Ribes alpinum. The New Atlas of the British Flora (Preston et al., 2002) suggests that the plant is native in 26x 10km squares, mainly on the Carboniferous Limestone but also on the Magnesian Limestone as in Richmond (NZ1601, NZ1701). Mountain Currant is often infected by a gall aphid Cryptomyzus korschelti.
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