30 



THE PSILOPHYTON FLORA 



[CH. 



Thursophyton^ (the Lycopodites hostimensis of Potonie and 

 Bernard) (Fig. 11, 2) from the Middle Devonian of Bohemia, 

 what are clearly sporangia occur in much the same way as in 

 Penhallow's plant. The sporangia here are also large, 1-5 to 



Fig. 11 . (1) Thursophyton Milleri. (Salt.) = T. Heidi, 

 Penh., from the Upper Old Red Sandstone of Scot- 

 land. A fertile shoot. After Reid and Macnair 

 (1899). (2) Thursophyton hostimense, (P. & B.), 

 from the Middle Devonian of Bohemia. Fertile 

 shoots. After Potonie and Bernard (1904). 



2 mm. in diameter, circular or perhaps a little elliptical. The 

 stem in this case is dichotomous and the leaves are apparently 

 broader and perhaps less crowded than in T. Reidi. We thus 

 have very little doubt that the fertile shoots of Thursophyton 



^ 1 Potonie and Bernard (1904), p. 45, Fig. 105 on p. 44. 



