SILURIC FUNGI FROM WESTERN" NEW YORK 225 



fied as to shape or size whether in the cell walls or open cell 

 spaces. In spite of the difference of host, for the present I prefer 

 to assign these Clinton fungi to the genus Peronospo rites 

 rather ihan to propose a new generic name on a very inadequate 

 botanical basis. The following three species are based on varia- 

 tions of the mycelium and hyphal swellings. The drawings are 

 made with a camera lucida. 



Peronosporites ramosus sp. nov. 

 Plate 16, fig. 1-3 

 This species is characterized by a mycelium about j4 ? 

 mm in diameter, which gives off branches freely. All parts of 

 the mycelium are uniform in size. Some hyphae are swollen at 

 their ends into a globular sac. These sacs vary in size from 

 y- 5 to -.fo mm in diameter, and are globular in form, 

 though they may be more or less ovate or even asymmetrical. 

 Rarely a hypha. after enlarging into a sac, continues farther; 

 though in one case a hypha has expanded into a second sac. 

 These more or less irregular swellings probably do not represent 

 sporangia or resting spores, which would be more regular in 



size and shape. 



Peronosporites globosus sp. nov. 



Plate 16, fig. i 



The mycelium is sit mm in diameter, enters from the 

 outer surface and branches but very seldom. At the ends of cer- 

 tain short hyphae are spherical swellings about - 3 ^- mm in. 

 diameter, quite uniform in size and shape. Being uniformly on 

 short hyphae, the swellings are near the surface of the host, and 

 may represent sporangia though no spores are present. This is a 

 common species. 



Peronosporites minutus sp. nov. 



Plate 16, fig. 5, 6 



The mycelium, about j-J^ mm in diameter, entering from 



the surface, penetrates straight downward into the shell without 



giving off branches. Frequently on the ends of long hyphae are 



spherical swellings too mm in diameter. These are very regular, 



