in habitat on roadcut in volcanic rhyolite tuff at upper canyon rim. Original ID as a rayless P. gentry, later confirmed as P. batopilensis by AM Powell. This site on the old gravel switchback road has now been destroyed by a new paved highway to Batopilas that also greatly limits access to many former rich roadside collecting sites in the canyon.
in habitat on roadcut in volcanic rhyolite tuff at upper canyon rim. Original ID as a rayless P. gentry, later confirmed as P. batopilensis by AM Powell. This site on the old gravel switchback road has now been destroyed by a new paved highway to Batopilas that also greatly limits access to many former rich roadside collecting sites in the canyon.
in habitat on roadcut in volcanic rhyolite tuff at upper canyon rim. Original ID as a rayless P. gentry, later confirmed as P. batopilensis by AM Powell. This site on the old gravel switchback road has now been destroyed by a new paved highway to Batopilas that also greatly limits access to many former rich roadside collecting sites in the canyon.
