Explanation of Plate XVI. 



Ascobolus immkrsus Pers. 



Fig. i, (J- Several plants, natural size. 



Fig. i, 6. Mature and immature plant, x 5. 



Fig. i, c. Mature plant, x 25. 



Fig. i, d. Ascus with spores and paraphyses, just before maturity, \- 300. 



Fig. i, e. Mature spore showing reticulations, x 600. 



Ascobolus glaber Pers. 



Several plants, natural size. 



Mature plant with projecting asci, x 20. 



Same removed from substratum. 



Ascus with mature spores and paraphyses, x 411. 



Mature spores showing numerous reticulations, x 12Q9. 



