42 



MORPHOLOGY OP ANGIOS PERMS 



of gametophytic tissue — namely, the reduced number of chromo- 

 somes (Fig. 53). With this division, therefore, the history of 

 the male gametophyte begins. This line of demarcation be- 

 tween sporophyte and gametophyte is easy to define, but does 



Fig. 15. — Forms of stamens. 1, Calandrinia compressa; 2, Solanvm Lycopergicum; 3, 

 Galanthus nivalis; 4i Cyclamen europaeum; 5, Ramnndia pyrenaica; 6. 7, Cassia 

 lenitiva\ 8, Pyrola rotund i folia; 9, Arctostayhylos Uva-ursi; 10, A.al/pina; 11, 

 Yaccinium uliginosum: 12, Pyrola unijlora; 13, Medinilln (after Baillon); 14, 

 Yaccinium Oxycoccus; 15, Calceolaria Pavonii; 16, Tozzia alpina; 17, 18, tjihbaldia 

 procumbens; 19, Galenjt.iis angusti folia ; 20, 21, Erythraea Csntaureum ; 22, 23, Me- 

 lissa officinalis; 24, 25, Calla palustris; 26, Xyctandra (after Baillon); 27, 28, 

 Globularia cordifolia; 29, 30, Theobroma Cacao; 31, Pinguicula vulgaris; 32, 

 Garcinia. — From Kerner's Ptfanzenleben. 



not result in so simple a conception of the alternating genera- 

 tions as to begin the gametophyte with the germinating spore, 

 for it involves the simultaneous origin of four gametophytic 

 generations from the mother-cell through an intermediate divi- 

 sion. The claim that the reduction division must be regarded 



