218 MICEOSCOPIC FUNGI. 



Erysiphei. 



Conceptacle with one sporangium. 



Appendages floccose Splicer otheca, 



Conceptacle with many sporangia. 



Appendages needle-shaped^ rigid . . . . Phyllactinia, 



Appendages hooked . . . . . . TJncinula. 



Appendages dichotomous . . . . . . Microsphceria. 



Appendages floccose Erysiphe, 



SPHiEROTHECA, LeV. 



Mycelium arachnoid ^ perithecia globose, containing a single 

 globose sporangium ; appendages numerous, floccose, — 

 Berk. Outl,, p. 404. 



Sphserotheca pannosa, Lev. Eose 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 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 XL 

 fi^. 216.) 



Phyllactinia, 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.) 



Uncintjla, Zev, 



Mycelium floccose ; perithecia globose ;"appendages rigid, simple, 

 bifid or dichotomous, uncinate, at length bent upwards. 

 —Berk, Outl,, p. 404. 



