PTERIDOPHYTA. 



1519 



macrospore ; thus almost suppressing the first or sexual generation. 

 The family Selaginellea includes only the living genus Se/agine//a, 

 which is mainly characteristic of the warmer regions, and especially 

 of the southern hemisphere. The stem is flattened, with two 



Fig. 1387. — Lepidode7idron Sternberg! ; from the Carboniferous. The left-hand figure 

 shows a cone, and the right the extremity of a branch. 



opposite rows of leaves, which are often of a glaucous hue, and 

 the fruit is in the form of long spikes, arising from the axils of 

 the leaves. It is considered probable that this genus is represented 

 in the Coal-measures of the Continent by species which have been 



