238 MICROSCOPIC FUNGI. 



ERYSIPHEI. 



Conceptacle with one sporangium. 



Appendages floccose ... ... ... Spha>rot}ieca» 



Appendages dichotomous, tips thickened PodosphcRra, 



Conceptacle voith many sporangia. 



Append a2:es needle-shaped, rigid ... PJiyllactinia. 



Appendages hooked ... JJncinula. 



Appendages dichotomous Microsphcsria. 



Appendages floccose Erysiphe. 



Sph^rotheca, Lev. 



Mycelium arachnoid ; perithecia globose, containing a single 

 globose sporansium; appendages numerous, floccose. — 

 Berk. OutL, p. 40i. 



Sphserotheca pannosa. Lev. Rose Blight ; mycelium 

 thickened, woolly, telt'cd, persistent; conceptacles minute, glo- 

 bose, scattered ; appendages floccose, white ; sporangium many- 

 spored.— On the branches, calvces, petioles, and leaves of Roses, 

 Very common. (Plate XI. figs. 217, 218.) 



Sphserotheca Castagnei, Lev. Hop Blight; on both 

 surfaces ; mycelium effuse, web-like, commonly evanescent; con- 

 ceptacles n)iuute, scattered, globose; appendages numerous, short, 

 flexuose above ; sporangium many-spored. — On ttie leaves of the 

 Jiop, Meaaow-sweet, and various other plants. Common. 

 (Plate XL. fig. 216.) 



Phyllactinia, L^v. 



Perithecia hemispherical, at length depressed, seated on a 

 persistent or evanescent membranaceo-granular receptacle ; 

 appendages straight, rigid, acicular, at length bent back. 

 —Berk. Outl., p. 404. 



Phyllactinia guttata, Lev. Hazel Blight; araphige- 

 nous; myceUum web-like, often evanescent ; conceptacles large, 

 scattered, hemispherical, at length depressed ; appendages hya- 

 line, rigid, simple; sporangia 4-20, containing 2-4 spores.— On 

 the leaves of Hawthorn, Hazel, Ash, Elm, Alder, Beech, Birch, 

 Oak, Hornbeam, and various other plants. Common. (Plate XI. 

 figs. 219, 220.) 



