_Conceptacle with many sporangia._ Appendages needle-shaped, rigid _Phyllactinia_. Appendages hooked _Uncinula_. Appendages dichotomous _Microsphæria_. 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. =Uncinula adunca=, Lév. WILLOW BLIGHT; mycelium variable; conceptacles scattered or gregarious, minute; appendages simple; sporangia 8-12, sub-pyriform, containing 4 spores.—On the leaves of Willows, Poplars, Birch, &c. Not uncommon. (Plate XI. figs. 221-224.) =Uncinula bicornis=, Lév. MAPLE BLIGHT; amphigenous; mycelium web-like, effuse, evanescent, or like a membrane and persistent; conceptacles large, hemispherical, at length depressed; appendages simple, bifid or dichotomous, uncinate; sporangia 8, sub-pyriform, containing 8 spores.—On the leaves of Maples. Common. (Plate XI. figs. 225-228.) MICROSPHÆRIA, _Lév._ _Mycelium_ arachnoid; appendages straight, dichotomous; branchlets swelling at the tip, or filiform.—_Berk. Outl._, p. 404.