Explanation of Plate XVIII. 



Ryparobius sexdecimsportjs ( Cr. ) Sacc. 



Fig. i, a. Plants, natural size. 



Fig. i, b. One plant, x 20. 



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



Fig. I, d. Spores, x 1500. 



Ryparobius pachyascus Rehm. 



Fig. ii, a. Diagram section, x 500. 

 Fig. II, b. Ascus with spores, x 1111,. 

 Fig. ii, c. Spores, x 2000. 



