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... one has glabrous stems and the other hairy stems, but as there are no stems yet that doesn't help.
I may have seen squamatus many years ago at Wallington (Northumberland), but the only one I've seen recently is didymus, so I leapt to that conclusion.
I've seen C. squamatus a few times in Berkshire in the last years, agreed less often than C. didymus. We need Tim Rich!
The easiest way to tell them apart is to smell them, isn't it? I can't remember which is the smelly one but any Flora should tell you.
Tim Rich is hiding. Scratch and sniff the photo!
after much scratching (of head) think probably didymus but am far from certain! Sorry
Lat/Lng: 52.952, 0.795
OS grid ref: TF878430