DESCRIPTION OF THE FIGURES. 



PLATE 1. 



Fig. 1. THbulina cylindrica, Bull. Portion of an aethalinm broken to show 

 the arrangement of the component sporangia ; nat. size. 



„ 2. Spore of same, x 1200. 



„ 2rt. 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. THhulina Jlexuosa, Mass., plasmodiocarp sporangia, x 40. 



„ 4. Spore of same, x 1200. 



„ 5. Ti(bvlina effnaa, Mass. Aethalium cut to show section ; nat. size. 



„ 6. Spore of same, x 1200. 



„ 7. Trichia fragilu, Rost., a. ge'unina, showing single sporangium ami 

 fasciculate or aethalioid form springing from the same hypo- 

 thallus, hence from tlie same plasmodium, x 40. 



„ 8. Var. serotina, of same, x 40. 



„ 9. Elater of same, x 500. 



„ 10. Spore of same, x 1200. 



„ 11. Cribrariaintricata,SchTa,d. Sporangium showing stem, o ; passing 

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

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

 sporangium, consisting of numerous nodes or irregularly angular 

 portions tilled 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. Spores and portion of capillitium of same, x 350. 



„ 14. Eideridinm olivaceiun, 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 mdann, Rost. 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. 



