458 BOTANICAL GAZETTE [june 





S 



of these species continue on as relics while new ones make their 

 appearance. 



Just west of the pine dunes at Miller and south of the Grand 

 • Calumet is such a transition region of mixed pine and oak. Along 

 the slope near the river is an abundant growth of mosses, but 

 nowhere except close to the water do they form as complete a cover- 

 ing as in the pine association. Toward the top of the slope they 

 become scattered, and there is also a decrease in the number of spe- 

 cies. Thuidium delicatulum continues on the lower slope with some 

 T. recognition. Other types found among the conifers are mixed 

 with new species, one of the most common of which is Fissidens 

 cristatus. Other forms, either new or now much more abundant, 

 are Mnium cuspidatum, Thelia Lescurii, Anomodon rostratus, 

 Climacium americanum, and Rhodobryum roseum. 



As mentioned previously, another ecologically more advanced 

 transition slope occurs south of Dune Creek near Tremont, Indiana. 

 Conditions here are even more favorable for mosses than at Miller. 



m 



indicate 



climax forest. The same 



ference in scattered moss patches on the upper slope and almost 

 continuous mat near the base is noticeable here as at Miller. The 

 most conspicuous species is Aulacomnium heteros tic hum, bearing 

 numerous sporophytes. Other mesophytic species not 



men 



ranella heteromalla. 



pomiji 



dry 



usually on tree bases. As already mentioned, both of these 

 transition slopes are near the lake, north facing and south of 

 streams. In striking contrast to these are transition slopes directly 



m 



proximity to streams. Here we see a rapid thinning 



moss flora. The more meso 



forms come in. These resemble the types found at 



meso 



In the early stages of the oak dune proper, either farther west 

 along the Calumet or south of the pine dunes at Miller as well as 

 at Paul and Furnessville, the mosses are still scattered. In 



