266 



b. Epispore distinctly warted, warts spinose; spores larger and 



darker than in a. 



5. Stemonitis Morgan! Peck. 



Spores densely but minutely warted with spinose 

 warts, 7-8//, reddish brown, dark with purple tinge; 

 capillitium, inner network loose, few branches, 

 outer net large meshed 15-40^; height of sporangia, 

 15-18 mm., rich reddish brown, dark with purple 

 tinge. 



6. Stemonitis Webberi Rex. 



Spores densely and very distinctly warted, 8-9//, 

 reddish brown; capillitium, inner net open, outer 

 net large, coarse, irregular meshes 50-125//; height 

 sporangia 18 mm., rusty brown. 



c. Epispore reticulate, lai'ge, dark, violaceous never brown. 



7. Stemonitis maxima Schw. 



Spores reticulate, 7-8//, dark violaceous; capil- 

 litium, inner net of medium density, outer net 

 meshes 8-40//; height of sporangia 5-10 mm., dark 

 purple brown, becoming pallid with age. 



The VEaETATiON of Abandoned Rock Quarries. 

 Mel T. Cook. 



The study of the encroachment of plants on waste land and the order 

 of their succession becomes especially interesting in the case of the aban- 

 doned rock quarries because of the very small amount of soil. 



The following observations were made from the study of three lime- 

 stone quarries in Greencastle, Indiana, and vicinity. It is impossible to 

 give the exact ages of these quarries; a small amount of rock is still 

 taken from them. Rough estimates will be given in the following de- 

 scriptions: 



Quarry A.— A small quarry, about ten or fifteen years old; about two- 

 thirds of the floor covered with water, which drains in from a small area; 

 no natural outlet. 



Quarry B.— A much larger quarry, about fifteen or twenty years old; 

 very long and narrow and extending east and west; the first work done in 



