Anatomy of the Cone and Fertile Stem of Equisetum. 263 
Literature quoted. 
Browne, I. M. P.: Contributions to our Knowledge of the Anatomy of the Cone and Fertile Stem 
of Equisetum. Ann. of Bot., vol. xxvi, 1912; 
Compter, G. : Revision der fossilen Keuperflora Ostthiiringens. Zeitschr. fiir Naturwissenschafteij, 
Bd. lxxxiii, Heft 2, 1912. 
Duval-Jouve, J. : Histoire naturelle des Equisetum de France. Paris, 1864. 
Halle, T. G. : Zur Kenntnis der mesozoischen Equisetales Schwedens. Kungl. Svenska Veten- 
skapsakademiens Handlingar, vol. xlv, No. 1, 1908. 
Hickling, G.: (1) On the Anatomy of Palaeostachya vera. Ann. of Bot., vol. xxi, 1907. 
- (2) The Anatomy of Calamostachys Binneyana , Schimper. Memoirs and Pro¬ 
ceedings of the Manchester Literary and Philosophical Society, vol. liv, No. 17, 1910. 
Jeffrey, E. C. : (1) The Development, Structure, and Affinities of the genus Equisetum. Memoirs 
of the Boston Society of Natural History, vol. v, 1899. 
(2) Are there Foliar Gaps in the Lycopsida ? Bot. Gaz., 1908. 
Jongmans, W. G. : Anleitung zur Bestimmung der Karbonpflanzen West-Europens, mit besonderer 
Berucksichtigung der in den Niederlanden und den benachbarten Landern gefundenen 
oder noch zu erwartenden Arten. Mededeelingen van de Rijksopsporing van Delfstoffen, 
No. 3, 1911. 
Milde, J. C. : Monographia Equisetorum. Verhandlungen der Kaiserlichen Leopoldino-Caroli- 
nischen deutschen Akademie der Naturforscher, Bd. xxxii, Abtheilung II. Dresden, 1867. 
Pfitzer, E.: liber die Schutzscheide der deutschen Equisetaceen. Pringsheims Jahrbiicher fiir 
wissenschaftliche Botanik, 1867-8. 
Scott, D. H.: Studies in Fossil Botany. Second edition, vol. i, 1908. 
Solms-Laubach, Ii. zu : Fossil Botany. English edition, 1891. 
Stiles, W. : On a branched Cone of Equisetum maximum. New Phytologist, 1908. 
. Sykes, M. G.: Tracheides in the Nodal Region of Equisetum maximum. New Phytologist, 1906. 
explanation of plates xii-xiv. 
Illustrating Lady Isabel Browne’s paper on Equisetum. 
PLATE XII. 
Longitudinal reconstruction of the xylem of Cone A of E. maximum. The xylem of the 
cone stele has been hypothetically cut and laid out flat. Axial xylem, black ; sporangiophore traces 
and parenchyma, white; outline of medullary strand, dotted. In this and in the reconstruction 
of the xylem of Cone B the size of the traces has been slightly exaggerated for the sake of clear¬ 
ness. x circa 20. 
PLATE XIII. 
Longitudinal reconstruction of the xylem of Cone B of E. maximum. Axial xylem, black; 
sporangiophore traces and parenchyma, white ; outline of medullary strand, dotted, x circa 20. 
PLATE XIV. 
Fig. 1. Transverse section of part of the axis of Cone A of E. maximum. Note the torsion of 
one of the traces, the relatively numerous small tracheides, and the absence of carinal canals, 
x circa 45. 
Fig. 2. Transverse section of part of the axis of Cone C of E. maximum , showing the forking 
medullary strand, and between it and the normal bundles a small group of cells such as occurs below 
the end of medullary tracheides. x circa 45. 
