DESCEIPTION OF THE FIGURES. 



Plate I. 



FIG. 



1. Pilaira anomdla, group of plants, nat. size. 



2, 3. Sporangia of same in diiferent stages of development, 



X 200.' 



4. Spores of same, x 400. 



5. Zygospore of same, x 200. 



G, Spowdinia aspergillus ; h^ zygospore ; a, a, susjDensors ; 

 c, c, mycelium, x 250. 



7. Formation of young zygospore of same ; a, a, arcliicarps, 



X 250. 



8. Formation of zygospore of same ; a, one of the gametes 



or conjugating cells ; h, one of the suspensors, X 

 250. 



9. Gonidial condition of same, x 250. 



10. Sporangium of same after dehiscence ; a, sporangial 



wall ; l), columella, X 350. 



11. Gonidia of same, X 400. 



12. Circinella Hmpleu:, entire fungus, X 250. 



13. Sporangium of same shoAving columella, x 400. 



14. Spores of same, x 400. 



15. Helicostylum elegans, portion of fungus, x 200. 



16. Sporangium of same, x 400. 



17. Spores of same, x 750. 



18. HeUcostyhim 7iigricans, entire plant, X 250. 



19. Optical section of sporangium of same showing colu- 



mella, X 250. 



20. Optical section of lateral sporangiolum of same, x 



350. 



21. .^ Spores of same, x 400. 



22. /S^/wce/j'/mZ/.s /rt>c/c'w?af a, portion of fungus, x 200. 



