British Bugs
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Bryocoris pteridis
Family: Miridae

 A small bug found on ferns. Adults can be brachypterous or macropterous and the head is at least partly dark brown or black. The 1st antennal segment is longer than the width of the head.
Widespread, and said to be common in the UK, especially in damp woodlands where it feeds on various ferns, but rarely on bracken. It may have a preference for shaded locations.

Compare: Monalocoris filicis

Adult: May - September
Length 2-4 mm 
 brachypter
Brachypterous adult: Lincoln (June 2008) ©Michael E. Talbot
Short-winged form Short-winged form
Brachypterous adult: north Wales (June 2008) ©Tristan Bantock

 Brachypterous adult: north Wales (June 2008) ©Tristan Bantock
Short-winged form nymph
Macropterous adult: Lincoln (June 2008) ©Michael E. Talbot

 Nymph: Lincoln (June 2008) ©Michael E. Talbot