364 BOTANICAL GAZETTE [may 



LITERATURE CITED 



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EXPLANATION OF PLATES XX AND XXI 

 (Figs. 1-6 are in the text) 



Fig. 7. — Transverse section of a rhizome of Botrychium ramosum at the 

 base of a branch: It, leaf trace; X20. 



Fig. 8. — Transverse section of the branch whose origin is represented by 

 figs. 4 and 7, showing the two branch steles: a, larger stele of the branch; 

 b, smaller stele of the branch; r, trace of root which connects with the smaller 

 branch stele; X20. 



