The original information posted at Peters Seed Research for PSR-37 was that it is a potato leaf line grown out of the original Early Girl hybrid predating the Early Girl Improved hybrid. I still have an original pack of PSR-37 seeds from Peters Seed Research circa 2004 or 2005.
But Peters Seed Research is defunct, and I don't know whether they ever sold seeds for a regular leaf PSR-37 line. Maybe someone has a link to a wayback shot of their online catalog, or even a scan of their print seed list? Until someone shows proof they did, my opinion will remain that PSR-37 is a potato leaf line, and that the so-called PSR-37 seeds that are out there now giving regular leaf plants are wrong seed sourced from that Silverseed fellow.
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