EXPLANATION OF PLATE XXVI. 



Blechnoxylon talbragarense, Eth. fil. 



Fig. 6. The impression of part of an internode, with a node in the round, 

 bearing a series of leaf-scars, spirally arranged, and each 

 pierced by a single vascular opening ; to some of the scars are 

 attached the frond petioles. Between the fronds above are 

 two scales similar to that seen in Fig. 5 ; x 4. 



„ 8. An internode and portions of two other.-, more or less decorticated ; 

 two nodes are indicated by the remains of two fronds projecting 

 from either side the stem ; - 2^. 



„ 10. Section of the stem prepared for the microscope. The black centre 

 represents either the pith, or the pith and primary wood, 

 whichever may have existed; the second zone with radii is 

 the secondary wood; the third zone of varying thickness, 

 caused probably by partial decomposition and extraneous 

 pressure, occupies the position of the phloeiu in the stem of 

 Botrychium ; whilst the fourth, or outer zone, represents the 

 parenchyma of the latter. The endo- and exodermal layers 

 are represented by the two outermost irregular rings; highly 

 enlarged. 



,, 11. A portion of the two innermost zones of Fig. 10, the dark centre 

 being the pith, or pith and primary wood, a.s the case may be, 

 and the outer radial cellular portion the secondary wood ; \'ery 

 highly enlarged. 



„ 17. The revolute end ot the right-hand side of Fig. 16 (PL xxvii.) 

 showing the supposed pedicels, one of them supporting a 

 round body that may be a sporangium ; very highly enlarged. 



