368 Sexuality, etc., of the Ascocarp o/'Humaria granulata. 



Plate 15. 



Fig. 17. — A group of nuclei from an ascogonium showing one fusion-nucleus with two 



nucleoli, another with nucleoli which are just fusing, x 2700. 

 Fig. 18. — Group of ascogonial nuclei of different sizes, x 2700. 



Fig. 19. — Ascogenous hyphse and vegetative hyphae showing the distinction of the nuclei. 

 xl900. 



Figs. 20 — 25. — Stages in the development of the ascus at ends of the ascogenous hyphse. 

 Figs. 26 — 28. — Three stages of the first nuclear division in the ascus. x 1900. 

 Fig. 29. — Spore formation in the ascus. x 1900. 



Fig. 30. — Section of young ascocarp showing the wedge of paraphyses bursting through 

 the peridium. The nearly empty ascogonium and stalk cells are visible. 

 xl75. 



Fig. 31. — Section through slightly older ascocarp when the peridium has been burst 

 through completely, the hymenial layer definitely arranged, and a certain 

 number of spores formed. The empty ascogonium is still visible, but the rest 

 of the archicarp has disappeared, x 60. 



