92 FAMILIAR LESSOi^S IN BOTANY. 



CHAPTER XII. 

 Section I. — Phenogamia. 



240. In the course of these conversations you have been 

 told of monocotyleclonous plants, with one cotyledon or seed- 

 leaf, stems growing by inner dejmsition, and called, iheve- 

 f ore, also, endogens ; dicotyledonons, having two seed-leaves, 

 the sap making exteinial deposits, Sind hence styled exogens; 

 ])olycotyledonoiis, having several seminal leaves, as seen in 

 the coniferous family, the pine, hemlock, etc. All these 

 have been described, and yet you have not been told that 

 there is another classification made, by which the vegetable 

 world is divided into two classes, styled jpar excellence the 

 two grand divisions, jjlienogamons and cryjitogamous. 



241. Fhenogamo2is (Greek, pliaino, appear, and gamos, 

 marriage) are plants Avhich have their stamens and pistils 

 visible. To make this division clear we will present a 

 table: 



[ \%\ 



Monocotyledons \'a\ Endogens : Palme, lilies, yuccas, etc. 



Phexogamous ■ 



-J 



o I 



" I Dicotyledons 

 I Polycotyledons 



■Exogens: Including all forest-trees, etc. 



Section II. — Cryptogamia. 



242. Cryptogamoiis (Greek, hrypto, to conceal, and gamos, 

 marriage) are plants with stamens and pistils invisible. 

 They are divided into : 



1. Felices, ferns. 



2. EqiiisetacecB, horse-tails. 



3. Musi, mosses. 



240. What are the grand divisions ? 



241. What does phenogamous mean ? Phenogamous plants include what ? 



242. What does cryptogamoua mean ? Give the botanical name of ferns. 

 Horse-tail. Mosses. Mushrooms. Lichens. Lycopodiura. Algae. 



