238 MICROSCOPIC FUNGI. 



ERYSIPHEI. 



Conceptacle with one sporangium. 



Appendages floccose ... Spharotheca. 



Appendages dichotomous, tips thickened Podosphatra. 



Conceptacle with many sporangia. 



Appendages needle-shaped, rigid ... Phyllactinia. 



Appendages hooked JJncinula. 



Appendages dichotomous Micros phceria. 



Appendages floccose Erysiphe. 



Spilerotheca, Lev. 



Mycelium arachnoid ; perithecia globose, containing a single 

 globose sporaugium; appendages numerous, floccose. — 

 Berk. Outl, p. 404. 



Sphserotheca pannosa. 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 Roses, 

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



Sphserotheca Castagnei, Lev. 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 XI. fig. 216.) 



Phyllactinia, IAv. 



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; amphige- 

 nous; mycelium 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. 2i9, 220.) 



