CHPAMPIPE RUE 
Isoetales. 
& 1. Jsoetes. 
Literature: Smith (139). 
The lowermost and outer leaves of the plant bear the 
microsporangia, those coming next are the megasporo- 
phylls, whereas the innermost ones are sterile. 
The megasporange is borne on the broad base of the 
leaf below the ligule, and is attached to the base of a 
cavity in the leaf with a short stalklet. From this cavity 
at the side of the ligule an indusium or velum is stretched 
out above the sporange. Between the apex of this indusium 
and the border of the cavity in general a fissure is left, 
which sometimes is very narrow and then gives the 
impression of the micropyle of an ovule, which indeed 
induced Braun to use this name. 
Lycopodiales. 
$ 2. Selaginella. 
Literature: Lyon (93). 
The description of the normal spore-producing members 
of Selaginella falls outside the scope of this paper, but I 
