PHANEBOGAMIA. 



241 



■which lies between the inner solid (woody) mass and the outer softer 

 portion. 



610, The Angiosperms are readily separated into two 

 sub-classes, as follows: 



Sub-Class I. Monocotyledones (the Monocotyledons). — 

 The first leaves produced by the embryo are alternate; 

 the endosperm is usually large and the embryo small. 



Sub-Class II. Diootyledones (the Dicotyledons). — The 

 first leaves of the embryo (cotyledons) are opposite; the 

 endosperm is very often rudimentary or entirely wanting, 

 and the embryo is generally large. - 



Fio. 136.— Longitudinal section of the seed of Indian Com. c, adherent wall 

 of the ovary; «■■ remains of the style; s/, base of the ovary (all the remainder 

 of the figure is the true seed); eg, ew, endosperm; sc, ss, cotyledon; e, its epi- 

 dermis; k, young leaves; w, the main root; lo', roots springing from the stem. 

 Magnified 6 times. 



Sub-Class I. The Monocottledoits (Monocotyledones). 



611. The first leaves of the embryo are alternate; hence 

 we say that they have one cotyledon. The venation of the 



