Jan., 1903.] 
Claytonia virginica. 
353 
Ohio Naturalist. Plate 5a. 
Cook on “Claytonia virginica.” 
EXPLANATION OF FIGURES. 
Iii the drawings, I,eitz stand and a B. and I. camera lucida were used. Figs, i to 8, a 
No 6 Zeiss ocular and a 1-12 B. and L immersion; in Figs. 9 to 21, a No. 6 Zei-s ocular and 
a No. 7 Zeiss objective; in Fig. 22, a No. 4 Feitz ocular and a No. 5 Feitz objective. 
Fig. 
1. Archesporial cell and two tapetal cells. 
2 a. One tapetal cell and beginning of the second division in the formation of the 
megaspores. 
2 b. F'our megaspores and three tapetal cells. 
3 Functional megaspore. 
4. Two-celled sac. 
5 . Four-celled sac and tapetal cells. 
6. Flight-celled vac. showing conjugation of polar nuclei. Also the three antipodal 
cells just before disorganization. 
7. Polar nuclei approaching. 
8. Eight-celled sac after conjugation of polar nuclei. First stage in absorption of 
nucellus from antipodal end of sac. 
q. Two-celled embryo and persistent synergid. 
10. Four-celled embryo and persistent synergid. 
11. Six-celled embryo. 
12. Eight-celled embryo and peristent synergid. 
13. Embryo “ “ “ 
, A •• 
15. “ with longitudinal wall in first suspensor cell. 
16. “ and persistent synergid. Also endosperm. 
17 Antipodal end of sac. showing massing of endosnerm about same age as in l ig.16'). 
iS. spherical embryo and persistent synergid : c. cotyledon ; p. plumule. 
19. Embryo showing suspensor; c, cotyledons (one large and one small'; p, plumule; 
and formation of calyptrogen a) above suspensor. 
20. Base of large embryo showing plumule <p , rudimentary cotyledon ic), and root- 
cap (r ) . 
21. Part of embryo showing rudimentary cotyledon (c) and plumule (p). 
22. Entire ovule sh wing mature embryo, with large cotyledon curved around a 
central mass of nucellus cells, which are rich in starch; a, outer integument; 
b, inner integument; end., endosperm. 
