BY L. RODWAY. 61 



The plants are very variable in general form, and it 

 is necessary to study their structure. A transverse sec- 

 tion is always desirable. 



Branches, broad 2 



At least ultimate branches less than 1 mm. 



wide 11 



2. Marginal cells larger than those of the 



cortex, generally colourless 3 



Marginal cells not distinct 7 



3. Concavci, thick, surface waxy ^^f^r/i^/.s 



Flat, marginal cells striate stolonifera 



Condition otherwise 4 



4. Branches pinnate 5 



Branches erect, simple 6 



5. Margin entire altcrniloha 



Margin dentate dentata 



6. Margin of rectangular colourless 



cells, but often indistinct erecta 



Margin with a conspicuous border of 

 large quadrate cells cochhata 



7. Surface conic-papillate tasmanica 



Surface armed with small rough 



papillae colensoi 



Surface smooth 8 



8. Margin acute 9 



Margin obtuse 10 



9. Robust, about 12 cells thick longiflora 



Broad, thin, about 5 cells thick... poJymorijha 



10. Concave to slightly convex pinnatifida 



Strongly biconvex crassa 



11. Main trunk and branches fiat, pinnules 



linear biconvex palmata 



All parts linear 12 



12. Strongly biconvex, margin obtuse ... cdcicome 

 Margin acute 13 



13. Margin not bordered 14 



Margin bordered 15 



14. Both surfaces slightly convex gracdis 



^ Ventral surface flat ijerpiisdla 



15. Small, stem and branches similar ... minima 

 Robust, decumbent, hirsute, branches 



erect, bi-tripinnate eriocmda 



