Weathered concrete surface with organic growth patterns.

Photographic documentation of aged concrete substrate displaying extensive discoloration, biological colonization, and surface degradation. Material composition involves cement-based matrix with visible patches of algae, lichen, and moss growth concentrated in darkened zones. Textural analysis reveals micro-fracturing, spalling patterns, and mineral deposits. Chromatic variation ranges from light grey to dark olive-brown across spatial distribution. Peripheral vegetation encroachment visible at lateral margins.