4/10/2010 · Nashua River Rail Trail, Groton, Massachusetts ≈ 6 × 9" (15 × 23 cm) ID is uncertain
Green starburst lichen on the left; gray (Parmeliopsis hyperopta) on right. · 4/7/2010 · Nashua River Rail Trail, Groton, Massachusetts ≈ 7 × 4½" (17 × 11 cm) ID is uncertain