368 Proceedings of the Royal Society of Edinburgh. [Sess. 
DESCRIPTIONS OF FIGURES. 
Fig. 1. Outline drawing of a radial longitudinal section of the middle region of 
a mature cone of Lycopodium cernuum. The dotted outline indicates the boundary 
of the mucilage cavity (m) against the persistent tissue of the sporophyll-base and 
axis, m.a., marginal appendage. The letters a , b, c indicate corresponding whorls 
of sporophylls in all the figures. Further explanation in text. 
Fig. 2. Tangential section of a mature cone of L. cernuum in the plane of the 
sporangial insertion. Lettering as in fig. 1. Explanation in the text. 
Fig. 3. Transverse section of a mature cone of L. cernuum at the level A A in 
fig. 1. Lettering as in fig. 1. Explanation in the text. 
Fig. 4. Transverse section of a mature cone of L. cernuum at the level B B in 
fig. 1. sp.a ., sporangial attachment. Other lettering as in fig. 1. Explanation in 
the text. 
( Issued separately June 22, 1908.) 
