a red and orange autumn ash leaf on a black background

ash autumn background billspenglerphotography black carbon carotenoids chlorophyll closeup colorful deciduous ecology environment environmental epidermis fall forest fraxininae fraxinus leaf leaves life macro mesophyll oleeae orange phloem photosynthesis photosynthetic plant red sclerenchymal season seasonal still stilllife structure tree xanthophylls xylem abscission foliage autumnal