152 VASCULAR PLANTS. 



CLASS H. VASCULAR CRYPTOGAMS. 



ORDER XL. DICHOTOMY. 



Ramification dichotomous. Each leaf pro- 

 ducing only 1 sporangium, borne on the upper 

 surface of the leaf and axils. 



Family ex. Selaginelleae. 



Macrosporangia and microsporangia. 



1. Selaginella, Beau v. 



Sporangia axillary, globose, transversely de- 

 hiscent. 



1i . leaves 4 — 8-ranked. 



SECTION FILICIN^l. 



Ramification not dichotomous. Leaves de- 

 veloped, frondose. Sporangia not single and 

 never on the upper surface of a leaf. 



ORDER XII. RHIZ0CARP.2E. 



Sporangia in sporocarps; heterosporous : mi- 

 crosporangia oo-spored; macrosporangia gener- 

 ally 1-sporecl. 



Family CXI. Marsilaeaceae. 



Sporocarps 2 — 4 locular, 2 — 4 valved, con- 

 taining macro- and microsporangia. Sporangia 



