Agaricus silvaticus / A. langei? Durham Botanical Gardens

Agaricus silvaticus / A. langei? Durham Botanical Gardens

Observation - Agaricus silvaticus / A. langei? Durham Botanical Gardens - UK and Ireland. Description: Large numbers of Agaricus species growing underneath single Scot’s Pine, open area of parkland. Young specimens have domed caps (Photos 2), eventually flattening (Photo 1); all caps show reddish-brown scales with white background. Skirt like ring present

Large numbers of Agaricus species growing underneath single Scot’s Pine, open area of parkland. Young specimens have domed caps (Photos 2), eventually flattening (Photo 1); all caps show reddish-brown scales with white background. Skirt like ring present on older specimens (Photos 3,4). Gills: close, free; colour pale pink to chocolate brown on older specimens. Stem and gills bleed red after short period (Photo 5). I was initially convinced that this was A. silvativus but now note several similarities with A.langei (including bleeding characteristic). Wondering whether these two species can be separated from macroscopic identification points? All advice welcome.