DESCRIPTION OF THE FIGURES. 



PLATE 1. 



FIG. 1. Tubvlina cylitulrica, Bull. Portion of an aethalium broken to show 

 the arrangement of the component sporangia ; nat. size. 



2. Spore of same, x 1200. 



2a. Diagrammatic view of a sporangium of same, showing the imper- 

 forate wall, the sporangia are usually hexagonal from mutual 

 pressure, and the free apical portion convex. 



3. Tubulina flexuosa, Mass., plasmodiocarp sporangia, x 40. 



4. Spore of same, x 1200. 



5. Tubulina effiisa, Mass. Aethalium cut to show section ; nat. size. 



6. Spore of same, x 1200. 



7. Trichia, fragilis, Host., a. genuina, showing single sporangium and 

 fasciculate or aethalioid form springing from the same hypo- 

 thallus, hence from the same plasmodium, x 40. 



8. Var. serotina, of same, x 40. 



9. Elater of same, x 500. 



10. Spore of same, x 1200. 



11. Cribraria intricata, Schrad. Sporangium showing stem, a ; passing 

 into a thin hypothallus, b ; calyculus or lower persistent portion 

 of sporangium, c ; and the permanent upper portion of the 

 sporangium, consisting of numerous nodes or irregularly angular 

 portions filled with coloured granules of lime, and connected by 

 long, thin internodes ; the spores have been blown away, x 250. 



12. Unnamed species. Group of sporangia, one of which is ruptured 

 above and showing the pale yellow spore-mass, x 40. 



13. Spdres and portion of capillitium of same, x 350. 



14. Enteridium olivaceum, Ehr. Aethalium ; nat. size. 



15. Fragment of sporangial walls of same, showing perforations, x 350. 



16. Spore-cluster of same, x 500. 



17. Single spore of same with the convex free portion (when in the 

 cluster) warted, x 1200. 



18. Diagrammatic representation of a sporangium of same showing the 

 perforated lateral wall. 



19. Tilmadoche nutans, Host. Single sporangium, x 50. 



20. Spores and portion of capillitium showing the small, elliptical 

 swellings containing lime, a, x 350. 



21. Spore of same, x 1200. 



