Explanation of Plate XV. 



Ascobolus ATRO-FUSCUS Phil I. & P/orc. 



Fig. I, a. Group of plants showing habitat, natural size. 



Fig. i, b. Several plants, x 2. 



Fig. i, c. Ascus and paraphyses, x 500. 



Fig. I, d. Diagram section, x 4. 



Fig. I, e. One spore showing verrucose markings, x 1200. 



Ascobolus furfurachus Pers, 



Fig. n, a. Group of plants, natural size. 



Fig. ii, b. Plants showing projecting asci, x }. 



Fig. ii, c. Ascus and paraphysis, x 4(1' >. 



Fig. ii, d. One spore to show reticulations, x L20 >. 



Fig. ii, c. Diagram section, x 5. 



