biology botany green leaf leaves nature photosynthesis plant tree veins venation autumn closeup colors colours fall macro pattern ramification sundautumn texture colorful colourful maple season antenna blue butterfly Celastrina England holly blue insect Insecta Lepidoptera little rhopalocera small summer Sussex tiny vein wing wings animal Arthropoda british compound eye dainty delicate eye fragile hindwing leg Leptidea sinapis perch Pieridae rare rest scale scales scarce sit Surrey underside wood white