50 



LYCOPODIALES 



[CH. 



great majority of species, in the dimorphic character of the 

 foliage leaves, which are usually arranged in four rows, the 

 laminae of the upper rows being very much smaller than those of 

 the lower (fig. 130, 1—3). The smaller leaves are shown more 

 clearly in fig. 130, la. It is obvious from an examination of a 



Fio. 130. Selaginella grandis. (1 — 3, nat. size.) 



Selaginella shoot, such as is shown in fig. 130, that in fossil 

 specimens it would often be almost impossible to recognise the 

 existence of two kinds of leaves. Some species, e.g. Selaginella 

 spinosa'^, the sole British representative of the genus, are 

 homophyllous and agree in this respect with most species of 

 Lycopodmm. Another feature characteristic of Selaginella, as 



1 Bruchmann (97). 



