AbstractTwo subspecies ofSphagnum imbricatumoccur in Britain and Ireland. Ssp.austinii(Sull.) Flatberg normally forms orange-brown hummocks on raised bogs and blanket bogs, but lax greenish forms can occur in very wet situations. Ssp.affine(Ren.,&Card.) Flatberg occurs as loose greenish or yellow-brown tufts in flushbogs, ditches, acidic marshes and wet woods.Sphagnum degeneransWarnst., from Cheshire, is a synonym ofS. palustreL.