fronds 



THE BRIAN OR DEVONIAN FORESTS. 



63 



fronds, apparently bearing on parts of the main stem or 

 petiole small rounded sporocarps. They are found abun- 

 dantly in the Middle Erian of the State of New York, 

 and also occur in Scotland, while one species appears to 

 occur in Nova Scotia, as high as the Lower Carboniferous 

 (Figs. 17, 18). 



These organisms have been variously referred to Lyco- 

 pods, to Algae, or to Zoophytes, but an extended compari- 



FIG. 18. Ptilophyton TTiomsoni (Scotland), a, Impression of plant in 

 vernation. 7>, Branches conjecturally restored, c, Branches of Lyco- 

 podites Milleri, on same slab. 



son of American and Scottish specimens has led me to 

 the belief that they were aquatic plants, more likely to 

 have been allied to Ehizocarps than to any other group. 

 Some evidence of this will be given in a note appended 

 to this chapter. 



