746 Boodle. — Anatomy of the Gleicheniaceae . 
EXPLANATION OF THE FIGURES IN PLATES 
XXXVIII AND XXXIX. 
Illustrating Mr. Boodle’s paper on the Anatomy of the Gleicheniaceae. 
The broken lines in the diagrams represent protophloem. The following 
lettering is used in several of the illustrations : e., endodermis ; i.e., inner endo- 
dermis ; x., xylem; fix , protoxylem \ fih., phloem; fifih protophloem; i.fih. 
inner phloem. Where x 1 '., fix' '., fih! '., fifih' . are used, they refer to the xylem, proto- 
xylem, phloem and protophloem respectively of a leaf- trace or petiolar bundle; 
sc., sclerotic tissue. Fig. 2 is from a photograph by Dr. E. C. Bousfield ; 
Figs. 24, 26, 27, and 32 are also from photographs. 
Fig. 1. Gleichenia flabellata, rhizome. Diagram of transverse section, a., 
epidermis and outer cortex ; b. and c., middle and inner zones of the cortex 
respectively, x 9. 
Fig. 2. Gleichenia flabellata, rhizome. Transverse section of the stele. x 50. 
Fig. 3. Gleichenia dichotoma, rhizome. Transverse section of outer part of 
stele, sc., innermost layer of sclerotic cortex; s.t., sieve-tube; x.fi., xylem- 
parenchyma. x 390. 
Fig. 4. Gleichenia circinata, rhizome. One lobe of xylem in transverse 
section, showing position of protoxylem {fix.), x 390. 
Fig- 5- Gleichenia circinata (var. rufiestris), rhizome. Radial section of outer 
part of stele, sc., scalariform tracheide ; x.fi., xylem-parenchyma. x 390. 
Fig. 6. Gleichenia dichotoma , young rhizome. Transverse section of outer part 
of stele, t.t., undifferentiated tracheides. x 390. 
Fig. 7. Gleichenia dicarfia, petiolar bundle. Transverse section, c.fi., cavity- 
parenchyma ; f, phloem-fibres, x 145. 
Fig. 8. Gleichenia dichotoma, petiole. Diagram of transverse section, x 45. 
Fig. 9. Gleichenia dichotoma , petiole. Diagram of transverse section of vascular 
bundle, x 45. 
Fig. 10. Gleichenia dichotoma, petiole. Transverse section of part of bundle, 
showing cavity-parenchyma {c.fi.) and adjacent tissues, x 390. 
Fig. 11. Gleichenia dichotoma, petiole. End of central strand of sclerenchyma 
and adjacent tissues in transverse section, x 390. 
Fig. 12. Gleichenia dichotoma, petiole. Elements of central sclerotic strand 
in longitudinal section, x 260. 
Fig- 13- Gleichenia dicarfia, petiole. Two brown-walled fibres separated by an 
endodermis from the surrounding sclerotic pericycle. x 390. 
Fig. 14. Gleichenia dichotoma, rhizome. Diagram of transverse section of the 
stele in the internode, r., a lobe of the xylem preparing for the separation of 
a root-stele, x 45. 
Figs. 15-19. Gleichenia dichotoma, rhizome. Diagrams of the stele in a series 
of sections through the node, n.i., nodal island. The broken lines surrounding 
the stele show the position of the protophloem, while those in the nodal island 
represent all the phloem that is present there. All x 45. 
