Explanation of Pirate XXV. 

 Cknangium populneum (Pers. ) Rehm. 



Fig. i, a. Cups natural size to show habitat. 



Fig. i, b. One cup, x 5. 



Fig. r, c. Ascus and paraphyses, x 1000. 



Fig. i, d. One spore, x 2000. 



Urnui^a craterium (Sr/izv. ) Fr. 



Fig. ii, a. Three stages in development of cup, natural size. 



Fig. ii, /;. Ascus and paraphyses, x 500. 



Fig. ii, c. Hairs from cup, x 1000. 



Fig. ii, d. One spore, x 1200. 



