Explanation of Plate 6 



Sph^rosoma echinulatum Seaver. 



a. Several plants natural size. 



b. Plants of different ages X -3. 



c. Section of a plant showing position of Hymeninm X 30. 

 fl. Ascus with spores before maturity X 500. 



e. Young spore showing surrounding membrane X 1000. 



f. Spore showing the early stages in the roughening of the outer sur- 



face X 1000. 



g. Ascus with paraphysis and spores at maturity X 600. 



J 42 



