48 Penhallow. — Nematophyton Ortoni, n. sp. 
EXPLANATION OF FIGURES IN PLATE V. 
Illustrating Prof. Penhallow’s paper on Nematophyton Oj-toni, n. sp. 
Description of Figures. 
Fig. i. Transverse section showing the general character of the structure. X45. 
Fig. 2. Longitudinal section showing the general character of the medulla, with 
trumpet-hyphae, and on the extreme left of the field a portion of a medullary spot, 
x 45- 
Fig. 3. Longitudinal section showing the occasional exposure of the tubular 
cells for a great length, trumpet-hyphae, and two medullary spots on the left. 
X 45- 
Fig. 4. Transverse section showing a cell of the medulla with, at the centre of 
the figure, three branches. The darker area of the field on the upper side is the 
side of a medullary spot, x 170. 
Fig. 5. Longitudinal section showing trumpet-hyphae at centre and left side, 
with crystals of silica occupying the spaces between the large tubular cells, x 170, 
