2\0 
Helen AI. Armour. 
h.n\. W*l. 
Fig- 11- 
1. Transverse section of part of very young sorus of Dipteris bifurcala 
showing paraphyses and young sporangia, spar., sporangium ; paraphysis. 
x 340. 
2. Transverse section of older sorus of Dipteris bifurcala. spor., 
sporangium ; pur., paraphysis. x 340. 
3. Median longitudinal section of sporangium of Dipteris bifurcala. spar., 
sporangium ; pur., paraphysis. x 340. 
4. Surface view of whole mature sorus of Dipteris bifurcala. x 55. 
5. Transverse section of sorus of Dipteris coujugata showing sporangia of 
various ages, spor., sporangium ; par., paraphysis. x 340. 
6. Transverse section of older sorus of Dipteris coujugata showing 
“ Mixta; ” condition, sp., spores; par., paraphysis. x 110. 
