Appendages floccose Erysiphe.
Sphærotheca, Lév.
Mycelium arachnoid; perithecia globose, containing a single globose sporangium; appendages numerous, floccose.—Berk. Outl., p. 404.
Sphærotheca pannosa, Lév. Rose Blight; mycelium thickened, woolly, felted, persistent; conceptacles minute, globose, scattered; appendages floccose, white; sporangium many-spored.—On the branches, calyces, petioles, and leaves of Roses. Very common. ([Plate XI.] figs. 217, 218.)
Sphærotheca Castagnei, Lév. Hop Blight; on both surfaces; mycelium effuse, web-like, commonly evanescent; conceptacles 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, Lév.
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, Lév. Hazel Blight; amphigenous; mycelium web-like, often evanescent; conceptacles large, scattered, hemispherical, at length depressed; appendages hyaline, 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.)
Uncinula, Lév.
Mycelium floccose; perithecia globose; appendages rigid, simple, bifid or dichotomous, uncinate, at length bent upwards.—Berk. Outl., p. 404.