52 BOTANICAL GAZETTE [JANUARY 
EXPLANATION OF PLATES IV-VI 
Microspore mother cells 
Fics. 1 and 2.—Young spore mother cell; nucleoli fusing; X 2400. 
IG. 3.—Same as fig. 1; nucleolar “papillae”; 2400 
Fic. 4.—Young spore mother cell; paired chromatin bodies; 2400 
Fic. 5.—Spore mother cell with one papillate nucleolus; promote 
bodies in pairs; XX 2400. 
Fic. 6.—Early synapsis; 1725. 
Fic. 7. —Synapsis; X1725. 
Fics. 8, 9.—Late synapsis; X1725. 
Fic. 10.—Spireme; 172 
Fic. 11.—Early spireme aa X 2400. 
Fic. 12.—Spireme; X 2400 
Fic. 13.—Late spireme; beginning of transverse segmentation of spireme; 
Fic. 14.—Strepsinema; X 2400. 
Fic. 14¢.—Pair of homologous chromosomes; same stage as fig. 14; 
Fic. 15.—Diakinesis; X 2400. 
Fics. 16-18.—Metaphase; X 2400. 
Fic. 19.—Late anaphase; X 2400. 
Fic. 20.—Interkinesis; X 2400. 
Fics. 21-26.—Homotypic phases. 
IG. 21.—Prophase; 1725. 
Fic. 22.—Late prophase; 172 a 
_ Fic. 25.—Metaphase; polar view of equatorial plate; 1725. 
Fic. 26.—Late anaphase; XX 2400 
Fic. 27.—Nucleus from somatic cell of young ovule; X 2400. 
Megaspore mother cells 
Fic. 28.—Early spireme stage; X 2400, 
Fic. 29.—Spireme; X 2400 
Fic. 30.—Spireme; later. uae than fig. 29; 2400 
Fic. 31.—Strepsinema; X 2400. 
Fics. 32, 33.—Diakinesis; 2400. 
