TABLE I 
AXIS LENGTH, PORE DIAMETER AND PORE-AXIS RATIO IN TRIPSACUM, TEOSINTE, MODERN AND FOSSIL MAIZE 
Number Pore-Axis Ratio Averages 
pollen grains Length | Diameter | Pore-Axis 
Species measured 3.0 3.2 34 3.6 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 7.0 72 74 76 78 80 90 Grain, #.| Pore, EL. Ratio 
Tripsacum 
T. australe No.1... 54 1 §& 15 16.11 «tee 57.4 14.3 1:4.0 
me Ge & es 25 1 2 38 5 ? 4 2 57.2 14.3 1:4.0 
T. dactyloides. . . . . 50 4 2 8 16 10 6 4 50.2 12.2 1:4.1 
T. lanceolatum .... 49 3.4 7 7 13 4 ll 49.9 12.5 1:4.0 
T. latifolium .. . . . 50 5 9 15 8 8 4 1 41.9 10.6 1:1.4 
T.laxum....... 50 2 16 #16 13+ «3 57.2 14.7 1:3.9 
T. maizar ...... 25 1 1341 2 2 6 4 Fea 41.7 10.3 1:4.0 
T. pilosum ..... 42 1 2 3 6 1310 5 2 57.1 14.7 13.9 — 
Teosinte 
Mexico, “Chalco”. . . 50 1 Bees 14 9 6 SB U1 if 81.8 15.9 1:5.1 
Guatemala No.1... 31 23 5 5 5 6 3 2 86.4 16.0 1:5.4 
Guatemala No.2... 32 4 4 6 4 3 2 79.3 14.7 1:5.4 
Maize 
United States 
Thompson Flint . . 50 1 5 7 15 6 6 3 3 2 2 120.7 19.4 1:6.2 
Thayer Flint. . . . 50 2 3 8 5 8 8 6 5 1 1 i 2 122.8 18.8 1:6.5 
Knobless ....., 30 2 2 2 8 12 2 2 118.8 18.2 1:6.5 
Mexico 
Chapalote ...... 50 6 8 4 6 8 4 8 4 2 94.9 15.4 1:6.2 
Vel cs 9 ho 50 11 1 5 8 10 7 6 4 5 1 96.6 15.6 1:6.2 
Nal-Tel ...... 47 2 4 10 6 5 2 2 4 4 2 8 2 i 8 87.2 13.2 1:6.6 
Tabloncillo .... ~ 50 12 3 6 6 9 8 3 6 oa 98.6 16.0 1:6.2 
Tuxpefo ..... 50 2 2 6 6 8 4 16 4 99.0 15.8 1:6.3 
Vandefio ..... 50 4 8 7 10 5 5 3 4 1 ie ia 97.1 16.1 1:6.0 
Zapalote Chico. . . 50 2 2 6 2 6 18 8 6 94.7 15.9 1:6.0 
Costa Rica No.1045. . 50 2 18 4 4 6 2 #4 8 2 104.6 16.0 1:6.5 
Peru 
No.300 ...... 50 5 6 9 10 10 7 38 95.7 15.8 1:6.1 
No. 420 ...... 50 2 212 4 14 8 4 .. 2 99.0 16.4 1:6.1 
No. 427, “Cuzco” . . 50 1 5 7 16 8 8 2 : ae 92.1 TS 1:6.0 
Archaeological 
Bat Cave, Late... 50 1 1 1 5 3 7 7 #10 6 2 3 4a 7) ada | 88.7 14.1 1:6.3 
Bat Cave, Early .. 10 2 I 2 1 1 1 ee 1. 93.1 152 1:6.1 
Fossil, Mexico City. . 14 1 ye | 3 1 2 ee 2 95.6 155 6.2 
