1914] Mccormick— symphyogyn a asp era 417 



29. Nemec, B., tJber die Mykorrhiza bei Calopogeia trichomanes. Beitr. Bot. 

 CentralbL 16:253-268, 1904. 



30. Peklo, J., Mykorrhiza bei Muscineen. Bull. Acad. Sci. Boheme. 1903. 



31. Schiffner, V., Hepaticae in Engler and Prantl's Naturlichen Pflanzen- 

 familien 1:1-144. 1899. 



32- Spruce, R., Hepaticae Elliotianae. Jour. Linn. Soc. Bot. 30:331-372. 

 pis. 20-30. 1893-1895. 



33- Stephani, F., Treubia insignis. Hedwigia 30:190-193. 1891. 



34- Tansley, A. G., and Chick, Edith, Conducting tissue system in Bryophyta. 



Ann. Botany 15:1-38. pis. 1, 2. 1901. 



35- 



Milium 



Ann. Botany 23:141-157. 1909. 



EXPLANATION OF PLATES XXX XXXII 



Symphyogyna aspera 



Fig. i. — Thallus with antheridia; X2. 

 Fig. 2. — Thallus with sporophytes; X2. 

 Figs. 3, 4. — Ends of rhizoids; X700. 

 Fig. 5. — Rhizoid containing a septate fungus; X700. 

 Fig. 6. — Tip of rhizoid showing a fungus; X 1600. 

 Fig. 7. — Transverse section of rhizome; X70. 



Fig. 8. — Outline of a longitudinal view of a cell from the central region 

 and three adjoining cells; X180. 



Figs. 9, 10. — Cells of thallus adjoining cells of central region; X180. 



Fig. 11. — Transverse section of aerial part of thallus; X170. 



Fig. 12. — Part of cell of central region showing pores; X2300. 



Fig. 13. — Transverse section of cells of central region; X 1300. 



Fig. 14. — End view of apical cell; X645. 



Fig. 15. — Section of apical cell parallel with the surface of the thallus; 



X645. 



Fig. 16. — Median longitudinal section of apical cell; X645. 



Fig. 17. — Median longitudinal section of wedge-shaped apical cell; X645. 



Fig. 18. — Transverse section of wedge-shaped apical cell; X645. 



Fig. 19. — End view of apical cell showing segment from which the wing 

 has its origin; X645. 



Figs. 20-22. — Stages in the development of the antheridium; X700. 



Fig. 23. — Median longitudinal section of thallus showing apical cell, 

 initial of archegonium, beginning of involucre, and beginning of development 

 of central cells; X645. 



Figs. 24-30. — Stages in the development of the archegonium; X645. 



Fig. 31. — Archegonium showing spiral arrangement of neck cells; X140. 



Fig. 12. — Archegonium showing probable fertilization; X1300. 



Fig. S3- — Archegonium showing a doubling of the neck canal cells in one 

 part; X645. 



