Fig. 14. Group of sporangia, × 2.

Fig. 14 a. The same enlarged to show general outline.

Fig. 14 b. The same; capillitial section, × 20.

Fig. 14 c. A single spore, × 1000.

EXPLANATION OF PLATE XVII

Cribraria argillacea (Pers.) Schrad., [p. 218.]

Fig. 1. Sporangium, highly magnified.

Cribraria macrocarpa Schrad., [p. 219.]