EXPLANATION OF PLATE XXVII. 
Blechnoxylon talbragarense , Eth. fil. 
12. Longitudinal section of portion of a caudex, prepared for the 
microscope. The centre lepresents either the pith, or the 
pith and primary wood, which ever may have existed ; the 
second zone with longitudinal lines is the secondary wood. At 
the sides are probably seen the bases of petioles; highly 
enlarged. 
13. A root and rootlets, but whether or no of this organism it is 
impossible to say ; highly enlarged. 
14. Horizontal section of a frond, prepared for the microscope, show- 
ing on the right-hand side epidermal tissue, and on the left 
dark brown patches between the veinules; highly enlarged. 
15. Longitudinal section of a frond, prepared for the microscope, 
showing the upper and lower surfaces clothed with setiform 
hairs, internal “tissue pillars,” alternating with clear vacui- 
ties, etc. ; highly enlarged. 
16. Cross section of a frond prepared for the microscope, showing 
the form of the frond, its revojute margins ; and on the right- 
hand side, filaments that may be pedicels for the support of 
sporangia ; highly enlarged. 
