EXPLANATION OF THE PLATE. 



ORGANOGRAPHY, jjage 44. 



A nnulate Sporangia 



FIG. 1. Sporangium with a vertical ring, mag. 100 diameters. 



2. horizontal ring, mag. 100 diameters. 



3. apical ring, mag. 100 diameters, 

 (a) Spores of each highly magnified, 200 and 300 diameters. 



Exannulate 



FIG. 4. Sporangia (two) free, opening by a vertical slit, 

 mag. 25 diameters. 



5. Sporangia united (synangium), opening by pores, mag. 7 



diameters. 



6. Sporangia united (synangium), opening by slits, mag. 9 



diameters. 

 (a) Spores of each highly magnified, 300 diameters. 



Indusia 



FIG. 7. Indusium peltate orbicular, slightly magnified. 



8. lateral reniform, ditto. 



9. calyciform, ditto. 



10. linear, interiorly attached, ditto. 



11. valvate, ditto. 



12. universal, ditto. 



