XXVlll a ANALYTICAL KEY. 



SERIES II. CRYPTOGAMOUS OR FLOWERLESS PLANTS: 

 those destitute of stamens and pistils, in fructification producing spores 

 instead of seeds. 



CLASS III. ACROGENOUS PLANTS. 



Plants with a stem containing woody tissue and vessels, as does the 

 foliage when there is any (in the form of veins). 

 Fructification borne on the leaves (fronds), commonly on 



their backs or margins 587 FILICES. 



Fructification of several spore-cases borne on the under 



side of the shield-shaped stalked scales of a terminal 



spike or cone. Leaves none, except a whorl of teeth 



at each joint of the stem 585 EQUISETACE^J. 



Fructification of spore-cases in the axil of small simple 



leaves or bracts. 602 LYCOPODIACE^E. 



Fructification at the base of leaves or naked branches. 



Aquatics 605 HYDROPTERIDES. 



CLASS IV. ANOPHYTES. (MOSSES.) 



Plants consisting of cellular tissue only, with stem and foliage distinct, 

 or sometimes the two confluent into a foliaceous body (frond). 



Spore-cases mostly opening by a lid. Leaves distinct. . . 607 Musci. 

 Spore-cases not opening by a lid. Leaves sometimes con- 

 fluent into a frond. 682 HEPATICEJE. 



