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1901] ANATOMY OF THE OSMUNDACEAE 419 
Jeffrey, to whom I wish here to express my obligations for his 
advice throughout. My thanks are due to Professor R. Ramsay 
Wright for the facilities afforded in the department. For some 
of the material used I am indebted to Mr. Oakes Ames, Assistant 
Director of the Botanical Gardens, Harvard University; Sir 
William Thistleton Dyer, Director of the Royal Gardens, Kew; 
Dr. Brodie, Toronto; and Mr. R. B. Thomson, B. A. 
UNIVERSITY OF TORONTO. 
EXPLANATION OF PLATES XIV-XVII. 
Abbreviations used, 
ep, Callus plugs. P, pericycle. 
¢, cortex, pA, phloem. 
é. ¢., external cortex. p. ph., protophloem. 
z. c., internal cortex. px, protoxylem. 
é, endodermis. u, “ quergestreckte Zellen.” 
é. é., external endodermis. ¥7%, root. 
z. é., internal endodermis. _ 5s. s. s., strands. 
4t, leaf trace. sc, sclerenchyma. 
m, medulla. x, xylem. 
m.r., medullary ray. 
PLATE XIV. 
I. Transverse section of the stem of Osmunda cinnamomea, 
Fic. 2. Transverse section of part of central cylinder of O. cinnamomea. 
- 3. Tangential section of O. regalis. 
Fig. 4. “Quergestreckte Zelle” of 7. barbara, showing sieve plates and 
Callus plugs. . 
FIG, 5. Transverse section of leaf trace of O. Claytoniana near the grow- 
ing point. 
Fig. 6. Transverse section of part of central cylinder of O. cinnamomea. 
Fig. 7. Sieve tubes of 7. barbara, showing sieve plates, “ globules bril- 
lants,” and callus plugs. ; 
Fic. 8. Transverse section of part of central cylinder of O. Claytontana. 
= 
PLATE XV. 
Fic. 9. Tangential section of Todea barbara, showing “ quergestreckte 
Zellen.” 
Fig. 10. Transverse section of O. cinnamomea, immediately above point 
of ramification, showing open branch gaps. 
