nj THE TWO FLORAS 13 



Psygmophyllum and a Leptophloeum and perhaps a Bothrodendron. 

 From Lower Devonian beds, a Psilophyton-like plant is known, 

 associated also with a doubtful Psygmophyllum (the Cyclopteris 

 sp. of Nathorst). 



United States and Canada. In the Perry Basin 1 , South-east 

 Maine, we find Psygmophyllum Brownianum, (Dawson), several 

 species of Archaeopteris (A. Jacksoni, Daws., A. Rogersi, Daws., 

 etc.), species of Sphenopteridium and Dimeripteris, associated 

 with archaic types such as Psilophyton, Barrandeina, Barino- 

 phyton, Leptophloeum, etc. This flora is Upper Devonian, pro- 

 bably Chemung, in age. In New York State, fossil plants 

 (Archaeosigillaria) occur in the Portage group of the Upper 

 Devonian 2 , and in the Middle Devonian of Ohio 3 (Corniferous 

 Limestone) where Barrandeina (the Caulopteris spp. of Newberry) 

 is associated with a Leptophloeum and petrified wood. Other 

 examples are also known, but are neglected here, since the 

 records are somewhat obscure. In Canada, a very similar flora 

 to that of Perry occurs in the Upper Devonian 4 ; but this is in 

 urgent need of revision. With regard to the Lower Devonian 

 flora of Gaspe, it is undoubted that species of Psilophyton and 

 Arthrostigma, and probably other types occur associated with 

 Nematophycus. But until this flora also has been revised, the 

 list of genera occurring on this horizon must remain somewhat 

 uncertain. 



Australia. In Devonian rocks in Australia, especially in 

 Victoria and New South Wales, Leptophloeum australe (usually 

 known as Lepidodendron australe) is frequent in beds assigned 

 with certainty to the Upper Devonian 5 , and possibly also in 

 others of Middle Devonian age. On the Genoa River, Auckland 6 , 

 a fragmentary leaf like that of Cordaites occurs, associated with 

 Archaeopteris, and Sphenopteris. The only archaic type known is 

 Barinophyton. A similar flora of Archaeopteris (A. Howitti and 

 A. Wilkinsoni), Sphenopteris, and Cordaites is associated with 

 Leptophloeum and possibly Bothrodendron in Victoria, but without 

 any archaic forms so far as is known. 



1 White (1905). 2 White (1907). 3 Newberry (1889). 



4 Dawson (1859) and (1871), excluding the fossil plants from St John's, 

 N.B., which are of Upper Carboniferous age. 



5 David and Pittman (1893). 6 Dun (1897). 



