Descriptio7i of the Figures, ix 



Plate III. 



FIG. 



38. Saprolegnia monoica, tip of a fertile branch; a, oogo- 



nium ; h, one of tlie perforations in its wall ; c, 

 antheridial branch, x 400. 



39. Pf/thium De Banjanum, portion of a specimen bearing 



terminal and intercalary gonidia, X 200. 



40. Fertile tip of branch of same ; a, antheridium ; h, 



oogonium ; c, the oosphere which has just become 

 rounded off, x 400. 



41 . Gonidium of same germinating and producing a germ- 



tube which will develop directly into a new plant, 

 X 400. 



42. a, gonidium of same germinating and giving origin to 



a zoosporangium, h, containing several zoogonidia, x 

 400. 



43. Entorrliiza Asrhersoniana, forming swellings on the 



root of Juncus lamprocarpus, nat. size. 



44. Spore of same, x 1200. 



45. Peronospora parasitv-ay an aerial gonidia-bearing 



branch, x 300. 



46. Gonidium of same, x 750. 



46a. Mature resting-spore of same, x 500, 



47. Saprolegnia elonr/afa, branch bearing zoosporangia ; 



a, a', empty zoosporaiigia ; h, V , zoosporangia contain- 

 ing zoogonidia, x 400. 



48. Zoogonidium of samo, x 600. 



49. Sexual condition of same ; a, oogonium ; l>, oospores ; 



r, antheridium, produced on a distinct branch, x 400. 



50. Protomyces maerosporus, pustules of mature spores on 



stem of ^^gopodium podograria, nat. size. 



51. Eesting-spores of same, x 400. 



52. Tilletia decii>iens, spore, x 1200. 



53. TiUefia tntici, spore, x 1200. 



54. Spore of same germinating ; a, promycelium bearing a 



tuft of promycelium spores, h, at the apex, some of 

 which have "conjugated" in pairs, X 460. (After 

 Tulasne.) 



55. Two promycelium spores of same that have "conju- 



gated " and afterwards produced a secondary spore, a, 

 X 750. (After Tulasne.) 



