tO, 5M7, 
,N°\ 
CONTENTS. 
No. Cl, January, 1912. 
PAGE 
Evans, A. W. — Branching in the Leafy Hepaticae. With thirty-six Figures in the Text . 1 
Scott, D. FI. — On a Palaeozoic Fern, the Zygopteris Grayi of Williamson. With Plates I-V 
and one Figure in the Text ........... 39 
MacDougal, D. T. — The Water-balance of Desert Plants. With Plates VI-X . . . 71 
Brenchley, Winifred E. — The Weeds of Arable Land in relation to the Soils on which 
they grow. II 95 
Bottomley, W. B. — The Root-nodules of Myrica Gale. With Plates XI and XII . . ill 
Spratt, Ethel R. — The Morphology of the Root Tubercles of Alnus and Elaeagnus, and 
the Polymorphism of the Organism causing their Formation. With Plates XIII 
and XIV 119 
Dale, Elizabeth. — O n the Cause of ‘ Blindness’ in Potato Tubers 129 
Dale, Elizabeth. — A Bacterial Disease of Potato Leaves. With Plates XV and XVI . 133 
Bliss, Mary C. — A Contribution to the Life-history of Viola. With Plates XVII-XIX . 155 
Holden, Ruth. — R eduction and Reversion in the North American Salicales. With Plates 
XX and XXI 165 
Hill, T. G., and de Fraine, Ethel. — O n the Seedling Structure of certain Centrospermae. 
With eight Figures and seven Diagrams in the Text 175 
Benson, Margaret. — C ordaites Felicis, sp. nov., a Cordaitean Leaf from the Lower Coal 
Measures of England. With Plate XXII and one Figure in the Text . . .201 
Barrett, J. T. — Development and Sexuality of some Species of Olpidiopsis, (Cornu) 
Fischer. With Plates XXIII-XXVI 209 
Welsford, Evelyn J. — The Morphology of Trichodiscus elegans, Gen. et Sp. Nov. With 
Plate XXVII ..." 239 
NOTE. 
Compton, R. IT. — Note on a Case of Doubling of Embryo-sac, Pollen-tube, and Embryo . 243 
No. CII, April, 1912. 
Davie, R. C. — The Structure and Affinities of Peranema and Diacalpe. With Plates XXVIII 
and XXIX 245 
Bower, F. O. — Studies in the Phylogeny ot the Filicales. II. Lophosoria, and its Relation 
to the Cyatheoideae and other Ferns. With Plates XXX-XXXVI . . .269 
Faull, J. H. — The Cytology of Laboulbenia chaetophora and L. Gyrinidarum. With 
Plates XXXVII-XL 325 
Digby, L. — The Cytology of Primula kewensis and of other related Primula Hybrids. With 
Plates XLI-XLIV and two Figures in the Text 357 
Reed, T. — Some Points in the Morphology and Physiology of Fasciated Seedlings. With 
nine Figures in the Text 389 
Delf, E. Marion. — T he Attaching Discs 01 the Ulvaceae. With Plate XLV and three 
Figures in the Text ............ 403 
Delf, E. Marion. — T ranspiration in .Succulent Plants. With one Figure in the Text . 409 
Stiles, W.— The Podocarpeae. With Plates XLVI-XLVIII and eight Figures in the Text 443 
Gibbs, L. S. — On the Development of the Female Strobilus in Podocarpus. With Plates 
XLIX-LIII 5 i 5 
Hume, E. M. Margaret. — T he Histology of the Sieve Tubes of Pteridium aquilinum, with 
some Notes on Marsilia quadrifolia and Lygodium dichotomum. With Plates LIV 
andLV • 573 
Hill, A. W. — The Production of Hairs on the Stems and Petioles of Tropaeolum pere- 
grinum, L. With Plate LVI and seven Figures in the Text ..... 589 
Duthie, Augusta V.— Anatomy of Gnetum africanum. With Plates LVII-LIX , . 593 
