264 
The Ohio Naturalist. 
[Vol. VIII, No. 4, 
LITERATURE. 
The literature bearing on the morphology of Geraniales is 
very scarce. The following works bear slightly on the subject. 
Britton, Nathaniel Lord, Manual of the Flora of the Northern 
United States and Canada. 1905. 
Coulter and Chamberlain, Morphology of Angiosperms. 1903. 
Rosendahl, C. Otto, Preliminary note on the Embryogeny of 
Symphocarpus foetidus, Salisb. Science N. S. 23: 590. 190(5. 
Schaffner, Mabel, The Embryology of the Shepherd’s Purse. 
Ohio Nat 7 : 1-8, pis. 1-3, 1906. 
EXPLANATION OF PLATES. 
All drawings were made with a Bausch and Lomb microscope with 
the aid of a camera lueida. In reproduction they were reduced to one- 
third their original size. The following combinations of oculars and 
objectives were used: 
Figs. 1—14, oc. in., obj. 1-0 in. Magnification 720. 
Fig. 15, oc. 2 in., obj. 1-12 in. Magnification 470. 
Figs., 16 and 17, oc. 2 in., obj. 1-6 in. Magnification 205. 
Fig. 18, oc. in., obj. 2-3 in. Magnification 146. 
Fig. 1. Young ovule with arcliesporial cell. X 360. 
Fig. 2. Large megaspore with non-functional ones above it. Nucellus 
beginning to disintegrate. X 360. 
Fig. 3. Two celled embryo sac. X 360. 
Fig. 4. Four celled embryo sac. X 360. 
Fig. 5. Seven celled embryo sac with the antipodals completely 
disintegrated. X 360. 
Fig. 6. Eight celled embryo sac showing entrance of pollen tube hiding 
disintegrating synergid. Polar nuclei uniting and antipodals 
beginning to disintegrate. X 360. 
Fig. 7. Fertilized egg and pollen tube. X 360. 
Fig. 8. The three celled pro-embryo. X 360. 
Fig. 9. Six celled embryo showing first appearance of the embryo 
proper. X 360. 
Fig. 10. Young embryo showing the octant stage and the division of the 
central suspensor cell by a longitudinal wall. X 360. 
Fig. 11. Slightly older stage in the growth of the embryo. The central 
suspensor cell undivided. X 360. 
Fig. 12. Somewhat more mature embryo showing the beginning of 
dermatogen. X 360. 
Fig. 13. More advanced embryo showing the beginning of the multi¬ 
cellular suspensor, dermatogen completely differentiated. X 360. 
Fig. 14. Embryo showing the origin of the cotyledons by the bulge on 
the opposite sides. Foot-like expansion of the suspensor becom¬ 
ing prominent. X 360. 
Fig. 15. Base of half-grown embryo showing differentiation of tissues at 
the root tip. X 235. 
Fig. 16. Nearly mature embryo showing different tissues and the multi¬ 
cellular base of the suspensor piercing the integuments and 
reaching the testa. Cotyledons obliquely cut so as to mask the 
regularity of tissue. X 100. 
Fig. 17. Haustorium-like region in the base of the suspensor. X 100. 
Fig. 18. Cross section of seed showing the mature embryo and cor¬ 
rugated te=ta. X 75. 
