I have compared them with Stace in detail yet, but I suspect that they've promoted all the morphs to species rank.
I've decided there''s 4 types of Male Fern in the old railway cutting not too far way, but I don't know what they all are - there's plenty Dryopteris filix-mas, and two small groups of very scaly, big, wintergreen plants, which I take to Dryopteris affinis, and a colony of a 3rd, which I suspect to be Dryopteris borreri. The 4th might be one of the hybrids. (Also present are Dryopteris dilatata, Polystichum setiferum, Polystichum aculeatum, Polypodium vulgare agg. (if not lost to council operations), Athyrium filix-femina, Pteridium aquilinum and Asplenium scolopendrium.
Update: On further reading there's a recently described species, the Alpine Male Fern, Dryopteris lacunosa, mostly from the Alps, but with records from elsewhere in Europe including Britain. Dryopteris pseudodisjuncta, recorded from Scotland, is omitted.
Some of the scaly ferns (but not all) and Phegopteris connectilis, are described as apomictic complexes. What I've found is that Phegopteris connectilis had diploid and triploid cytotypes, but I've so far failed to find any documentation of a complex.
Mildly to my surprise they haven't split Asplenium trichomanes. (Personally I record them as Asplenium trichomanes agg., as I reckon there's 3 species present in Britain even if I can't tell them apart - what I see may be all Asplenium trichomanes subsp. quadrivalens.)