viil Description of the Figzires. 



FIG. 



23. Single sporangium of s»ame, x 400. 



24. Rhiwpus iiigrirans, sporangiferous condition, X 250. 



25. Sexual condition of same ; a, the large septate sus- 



pensor ; h, the small aseptate suspensor ; c, zygo- 

 spore, X 400. 



Plate II. 



26. Monohlepharis splicerica, portion of fungus, x 25. 



27. Tip of a filament of same bearing an oogonium, o, and 



an antheridium, a ; the oogonium has opened at the 

 apex and contains an oosphere ; the antherozoids are 

 escaping from the autheridium, x 800, (After 

 Cornu.) 



28. Portion of a filament of Leptomitus hrachynema, bearing 



zoosporangia, X 250. 



29. Mortierella polycephala, x 500.* 



30. Chlamydogonidia or acrogoniclia of same, X . (After 



Van Tiegheim.) 



31. Aclihja polyandra ; a, oogonium ; h, oospores ; Cj an- 



theridium, X 300. 



32. Aclihja racemosa, tip of a fertile branch with an empty 



zoosporangium, a ; h, the escaped zoogonidia forming 

 a hollow sphere at the apex of the zoosporangium ; 

 lower down on the branch are two oogonia ; c, 

 oogonium; e, oospores; d, antheridia, X 145. 

 (After De Bary.) 



33. Thamnidium vertleillatum, erect sporangiferous branch; 



«, the terminal large sporangium ; h, sporangiola 

 borne on whorled lateral branches, X 100. 



34. Optical section of terminal sporangium of same showing 



columella, highly x . 



35. Optical section of lateral sporangiola of same, highly x . 



36. Rhizidiam Westiij several plants parasitic on Spirogyra 



nitida, seen in optical section ; the contents of the 

 host are omitted, X 300. 



37. The same, parasitic on Cladrphora glomercda ; e, the 



thick stratified cell-wall of the host ; «, uj^per, 6, 

 lower cell ; c, rhizoids that are permeating the proto- 

 plasm of the host ; c?, sporangium ; d' , sporangium 

 ruptured and zoogonidia escaping, X 1200. 



