Trichome and leaf surface comparisons of Raveniopsis microphyllus (A–E) and R. breweri (F–G). A Abaxial side of leaflet showing trichomes transitioning from rosulate to porrect-multiradiate with central long radii at margin (sampled from proximal margin of lateral leaflet) B Back of rosulate trichome showing central multicellular attachment stalk, and curled free arms C Adaxial side of young leaflet showing multiradiate trichomes, and rosette bases of trichomes that have weathered off D Abaxial side of leaflet with most trichomes removed to show dense stomata and stalk bases of rosulate trichomes; note fungal hyphae on epidermis E Close-up of stomata and stalk base of rosulate trichome F Raveniopsis breweri abaxial trichome G Back of Raveniopsis breweri abaxial trichome, showing central multicellular attachment stalk. (Abbreviations: s = stalk. Source: R. microphyllus, A–E Tripp 3191, US; R. breweri, F–G Prance & Huber 28254, US).