[Fig. 1]. A section through the thallus of Peltigera canina, showing the cortex above and the medulla below, the medullary hyphae of the lower portion running in a somewhat horizontal direction. The algal cells shaded. X 380.
[Fig. 2]. A section through the thallus of Nephroma helvetica, showing the cortices, upper and lower, and the mycelial medulla within. The algal cell shaded. X 760.
[Fig. 3]. A section through a cephalodium of Peltigera aphthosa; a, the surrounding cortex; b, the internal hyphae and the cells of the algal host; c, the supporting hyphae from the thallus below. Partly diagramatic. X 48.
[Fig. 4]. A small portion of a section through the exciple of Peltigera canina, showing the plectenchymatous structure. X 380.
PLATE XIV.
