Large green Peltigera in the PNW

species	back of apothecia	lower surface veins	cephalodia	notes
aphthosa	continuously corticate	low, indistinct, darkening towards center abruptly	appressed
britannica	continuously corticate	low, indistinct, darkening towards center abruptly	raised
leucophlebia	patchy corticate or lacking	distinct, darkening towards center gradually	appressed
chionophila	continuously corticate	distinct, darkening towards center gradually	appressed	only found in areas with significant snow in the winter; lobes not crisped