468 BOTANICAL GAZETTE [JUNE 
metaxylem of the genus was primitively centripetal, as in E. gigan- 
teum, or primitively centrifugal, as in the other species the detailed 
anatomy of which is known to us, is left open: 
UNIVERSITY COLLEGE 
LONDON 
LITERATURE CITED ~ 
1. Barratt, Miss K., A contribution to our knowledge of the vascular 
system of the genus Equisetum. Ann. Botany 34:173-200. 1920. 
Bower, F. O., The origin of a land flora. London. 1908. 
Browne, IsaBet M. P., Contributions to our knowledge of the anatomy 
of the cone and fertile seen of Equisetum. Ann. Botany 26:663-703. 1912. 
~————-, A second earns to our knowledge of the anatomy of the 
cone sad fertile stem of Equisetum. Ann. Botany 29:231-264. 191 
hylogenetic Sian Abed on kee internodal vascular seul 
of Hodeiie. New Phytol. 19: 11-25. 
. EAMES, A. J., On the occurrence of sa ace xylem in Equisetum. Ann. 
Botany 23:587-6or. 1900. 
GwynneE-VaucHAN, D. T., Remarks upon the nature of the stele of 
Equisetum. Ann. Botany 15: 1901. 
. JANCZEWSKI, E. pg, Recherches sur le développement des bourgeons dans 
les Préles. Mem. Soc. Nat. Sci. Naturelles de Cherbourg. 20: 
. Jerrrey, E. C., The development, structure, and affinities of the pete 
Equisetum. Mec: Boston Soc. Nat. Hist. 5:155—190. 1899 
Lupwics, K., Untersuchungen zur Biologie der Equiseten. Flora 3: 1911. 
. Mitpe, J., Monographia Equisetorum. Nova Acta Academiae Cesareae 
Leopoldineae Carol: Germanieae Naturae Curiosorum. 32: Dresden. 1867. 
. Prirzer, E., Uber die Schutzscheide der deutschen Equisetaceen. Jahrb. 
Wiss. Bot. 1867- 
. Porrautt, G., Recherches d’histogénie végétale. Développement des 
tissus dans les organes végétatifs des Cryptogames vasculaires. Mém 
Acad. Imp. Sci. St. Petersbourg 37: 1890. 
. Quéva, C., Histogenése et structure du stipe et de la fronde des Equisetum. 
Mem. Soc. Hist. Nat. d’Autun. 20: 1907. 
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