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S-0: pure cellulose (a,f,k), S-50: 50% lignin (b,g,l), S-75: 75% lignin (c,h,m), S-90: 90% lignin (d,i,n), S-95: 95% lignin (e,j,o). Magnification: ×5,000 (a–e) and ×50,000 (f–j). Scale bars, 20 μm (a–e), 2 μm (f–j), 1 cm (k–o).
