238 MICROSCOPIC FUNGI. 



ERTSIPHEI. 



Coticeptacle with one sporangium. 



Appendages floccose ... ... ... Spharotheea. 



Appendages dichotomous, tips thickened Podosphaira. 



Conceptacle with many sporangia. 



Appendages needle-shaped, rigid ... Phyllactinia. 



Appendages hooked Undnula. 



Appendages dichotomous Microspheeria. 



Appendages floecose Erysiphe. 



SPHiBHOTHECA, LSv. 



Mycelium arachnoid y perithecia globose, containing a single 

 globose sporangium; appendages numerous, floccose. — 

 Berk. Outl., p. 404. 



Spbeerotheca panuosa, Lev. Rose Blight ; mycelium 

 thickened, woolly, felted, persistent ; conceptacles minute, glo- 

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

 spored. — On the branches, calyces, petioles, and leaves of Hoses. 

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



Sphserotheea Castagnei, L^v. Hop Blight; on both 

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

 ceptacles minute, scattered, globose; appendages numerous, short, 

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

 Hop, Meadow-sweet, and various other plants. Common. 

 (Plate XL fig. 216.) 



Phyllactinia, Uv. 



Peritliecia hemispherical, at length depressed, seated on a 

 persistent or evanescent membranaoeo-granular receptacle ; 

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

 —Berk. Outl., p. 404. 



Phyllactinia guttata, L^v. ELizei. Blight; amphige- 

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

 seattered, 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 XL 

 figs. 219, 220.) 



