464 WOODBURN: EMBRYOLOGY OF REBOULIA HEMISPHERICA 



LITERATURE CITED 



1. Black, Caroline A. The morphology of Riccia Frostii Aust. Ann. 



Bot. 27: 511-532. pi. 37, 38. 1913- 



2. Cavers, F. Contributions to the biology oi the Hepaticae. Part 

 I. Targionia, Reboulia, Preissia, Monoclea. Leeds and London. 

 March, 1904. 



3. Garber, J. F. The life history of Ricciocarpus natans. Bot. Gaz. 

 37: 161-177. pi. o, 10 +/. 1-4. 1904. 



4. Meyer, K. Untersuchungen iiber den Sporophyt der Lebermoose. 



Entwickelungsgeschichte des Sporogon der Corsinia marchantioides. 

 Bull. Soc. Imp. Nat. Moscou 1911: 263-286. pi. n +/. 1-22. 

 1912. 



Explanation of plate 19 



The figures were drawn by Miss Mary C. Blair. 



FIG. i. Early stage of fusion of the egg and sperm nuclei, X 1775- 



FIG. 2. Telophase of first division of zygote, X 565. 



FIG. 3. First division of zygote completed; hypobasal cell "a," and epibasal 

 cell "b" in prophase of subsequent division, X 735. 



FIG. 4. Division of epibasal cell completed, showing tier of three cells, X 565. 



FIG. 5. Young embryo consisting of tier of four cells, X 565. 



FIG. 6. Hypobasal cell divided longitudinally; cell next above in process of 

 longitudinal division, X 565. 



FIG. 7. Young embryo with wedge-shaped apical cell, X 735. 



FIG. 8. Young embryo with both basal and apical cells triangular in shape, 

 X735- 



FIG. 9. Embryo, older than in any of the preceding figures, with wedge-shaped 

 apical cell X 565. 



FIG. 10. Slightly more advanced embryo than in FIG. 9, showing both apical 

 and basal cells triangular in outline, X 565. 



FIG. ii. Embryo showing early differentiation of foot "a," seta "b," and 

 capsule "c," X 565. 



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