26 Carl Fred. Kolderup. 
all these remains, except for some few Aphyllopterisforms, 
belonged to a Psilophyton species. Fig. 14 an 15 will give 
a good impression of these remains of plants. Fig. 15 a presents 
a piece of a stalk with impression on it of the thorns, and 
fig. 15 b shows us the thorns themselves, they are at least 2 mm. 
long and are mostly placed vertically on the stalk.  Psilo- 
phyton is related to the older middledevonian forms. 
