7 6 Sykes. — The Anatomy and Morphology of Tmesipteris. 
synangium with two leaves. The position of the odd leaf was rather 
unexpected ; conceptions derived from the usual symmetry would have led 
me to suppose that it belonged to the branch bearing the abnormal 
synangium, but its trace clearly arose from the stem stele after the departure 
Figure X. Apical region of an adult plant, showing a three-sporangiate synangium ; 
A — front, B — back. 
of the branch-trace. The three-sporangiate synangium appeared to receive 
three bundles from the pedicel trace, but there were difficulties in its 
XI. XII. 
Figure XI. Abnormal branch, bearing extra leaf (x). e, e — two leaves of branch, 
unusually small ; A-E — level at which sections A-F, Text-fig. XII, are taken. 
Figure XII. A-F , series of cross-sections taken at level A-F in Text-fig. XI. Letters as 
in Text-figs. VIII and XI. 
investigation, and it is quite possible that a fourth was also present. All 
the loculi of the synangium contained normal spores. 
2. One lateral branch had an extra leaf (Text-fig. XI, x). The leaf- 
