Cavers: Some Points in /he Bioloffy of Hepaticce. r 



several strings of cells which contain mucilag-e. Very often 

 there is a well- 

 marked zone ot 

 cells extending 

 across the midrih 

 and containing 

 densely interwoven 

 fungal hyphye ; this 

 mycorhizal zone 

 generally lies im- 

 mediately below the 

 air-chambers. The 

 lower surface of the 

 midrib bears two 

 longitudinal rows 



F'K- 5. - Fegatella conica. Part of a vertical section 

 ot the thallus, showing an air-chamber, lined by 

 pointed cells and opening above by a pore in the 

 epidermis. X 180. 



of ventral scales, each scale consisting of a nearly circular free 

 portion whicli is reddish or purple in colour, and a basal colour- 



Fig. 6. — Fegatella conica. Longitudinal section through growing point oi 

 ihallus. X., initial-cell; P., pore; A. C, air-chamber; V. S., ventral 

 scales; M. C, mucilage cells; O. C, cell containing a large oil body. 

 X 180. 



less portion which is attached to the side of the midrib by its 

 outer margin, whilst its inner margin overlaps the scale next in 

 front. The notch in which lies the growing-point of each branch 

 is partly filled by the overlapping coloured appendages of the 

 younger scales, which bend upwards and backwards over the 

 growing-point (Fig. 6). From the sides of the midrib there 



1903 May I. 



