XVI 



FOSSU. AKCllEGONIATES 59i 



different in form from those of Lycopodiuin. The spores are 

 very i)eenliar in having- a sort of wini;-, su<^^<^^estin^ tlie ai)i)en(l- 

 ages of tlie ])ollen-s])ores of Piniis. 



It seems extremel) probable that in some of the Palicozoie 

 LycopocHnese seeds were developed The fossil seed deseribed 

 as Cardiocarpon has been shown to be borne upon a cone which 

 is almost identical with Lcpidoslrobiis. 



t 



PSILOTACE^ 



Certain fossil remains have been classed with the Psilotaceae, 

 but there is much doubt as to the accuracy of these conclusions. 

 Solms-Laubach (2) says: "The statements respecting fossil 

 remains of the family Psilotacese are few and uncertain, nor is 

 this surprising in such simple and slightly differentiated forms. 

 If Psilotites .... does really belong to this group, a point which 

 I am unable to determine from the figures, we should be able 

 to follow the type as far down as the period of the Coal- 

 measures." 



The genus Psilophyton, which has been found in the upper 

 Silurian, is regarded by Dawson as related to the Psilotacese. 

 but there seems to be much question about the accuracy of his 

 conclusions. 



