PAGE 
CONTENTS. 
Fischer, C. C. E. — The Biology of Armillaria mucida, Schrader. 
With Plates XXXVII and XXXVIII 
Fraser, H. C. L, and Brooks, W. E. St. J.— Further Studies on 
the Cytology of the Ascus. With Plates XXXIX and XL, 
and a Figure in the Text ' 537 
Davis, B. M.— Cytological Studies on Oenothera. I. Pollen Develop- 
ment of Oenothera grandiflora. With Plates XLI and XLII . 551 
Acton, E.— Coccomyxa subellipsoidea, a new member of the Palmel- 
laceae. With Plate XLI 1 1 573 
Acton, E. — Botrydina vulgaris, Brebisson, a primitive Lichen. With 
Plate XLIV, and a Figure in the Text 579 
Eames, A. J. — On the Occurrence of Centripetal Xylem in Equisetum. 
With Plate XLV . .... . . . .587 
Osborn, T. G. B. — The Lateral Roots of Amyelon radicans, Will., 
and their Mycorhiza. With Plates XLVI and XLVII . . 603 
Yendo, K. — On the Mucilage Glands of Undaria. With Plate 
XLVIII 613 
Benson, M., and Welsford, E. J. — The Morphology of the Ovule 
and Female Flower of Juglans regia and of a few allied Genera. 
With eight Figures in the Text 623 
Thoday, D., and Sykes, M. G.— Preliminary Observations on the 
Transpiration Current in Submerged Water-plants . . .635 
Lewis, I. F. — The Life History of Griffithsia Bornetiana. With 
Plates XLIX-LI 1 1 , and two Figures in the Text . . . 639 
NOTES. 
Campbell, D. FI. — The Prothallium and Embryo of Danaea. Pre- 
liminary Note 691 
Kershaw, M. — Further Observations on the Structure of the Ovules 
of Myricaceae and Allied Groups . . . . . 692 
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