218 IIICEOSCOPIC FUXGI. 



Erysiptiei. 



Conceptacle icith one sporangium. 



Appendages floecose Sphcerotheca. 



Conceptacle with many sporangia. 



Appendages needle-shaped, rigid .. .. Phijllactinia. 



Appendages hooked Uncinula. 



Appendages dichotomous Microspharia. 



Appendages floecose Erysiphe. 



Sph^heotheca, Lev. 



Mycelium arachnoid ; perithecia globose, containing a single 

 globose sporangium ; appendages numerous, floecose.— 

 Berk. Outl., p. 404. 



Sphserotheca pannosa, Lev. Rose Blight; mycelium 

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

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

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

 Very common. (Plate XL 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.) 



Phtllactinia, Lev. 



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 XL 

 figs. 219, 220.) 



IlNCixirLA, Lev. 



Mycelium floecose ; perithecia globose ;'appendages rigid, simple, 

 bifid or dichotomous, uncinate, at length bent upwards. 

 —Berk. Outl., p. 404. 



