Piece of thallus of Parmelia conspersa, with section through an apothecium.
Asa Gray The Elements of Botany for Beginners and for Schools (New York, Cincinnati, Chicago: American Book Co., 1887)
2400×1089, 420.6 KiB
1024×464, 57.8 KiB
640×290, 31.6 KiB
320×145, 13.2 KiB