Devonian Plants* 



Fsilotum*y witb which these plants very closely correspond in all 

 except their rhizomes and the circinate terminations of the 

 branchlets. The name proposed above is intended to express this 

 relation, as well as the most apparent distinction between these 

 plants and those of the genera Lyco2Jodites and Selaginites\. To 

 the species above described I would give the name of Psilophy- 

 ion princeps. I have attempted a restoration of its general ap- 

 pearance in fig. 1 /. 



in 



Fig. 2 



S 



Fig. 2 h Fig. 2 i Fig. 2 k 



Fig. 2 g", longitudinal section of stem, nat. size ; h, cortical cells (300 

 diams.) ; i, parenchyma (300 diams.) ; fc, scalariform tissue 

 of axis (300 diams.) 



Some of my specimens appear to indicate a second species, 

 characterized by more robust stems, more finely ridged, and 

 having slender alternate branches, which bifurcate frequently and 

 usually bend downward. The specimens are not well preserved, 

 but are very distinct from P, princeps^ while probably generically 

 related to it. I would name this species P. rohustius. 



* See Brongniart, V^g. Fos. vol. ii. pis. 6 & 11. I have been favour- 

 ed by Prof. Gray, of Harvard College, with specimens of P. flavidum 

 from Tahiti and P. triquetrum from Australia, which closely resemble 

 the fossils in structure and surface-markings. 



t I should have preferred the term " Psilotites ; " but this has been 

 preoccupied by a Jurassic plant, of which, however, I cannot find any 

 detailed description. See linger, Gen. et Spec, &c. p. 279 ; Brongniart* 

 Tableau des Genres, p. 41. 



