APPENDIX. 241 



Erysiphe, He^ho. 



Mycelium arachnoid ; appendages Aoccosp, simple or irregularly- 

 branched. — Berk. Outt., p. 404. 



* Sporangia 2-spored. 



Erysiphe Linkii, Lev. Mugwort Blight ; art>phigenous ; 

 mycelium web-like, fugacious or persistent; couceptacles minute, 

 globose, scattered, emersed ; appendages white, interwoven with 

 the mycelium ; sporangia 8-20, pyriform, with elongated pedicels. 

 —On leaves of Mugwort. Autumn. Frequent. (Plate XII. 

 figs. 248, 249.) 



** Sporangia 3-8-spored. 



Erysiphe lamprocarpa, Ley. Composite Blight; am- 

 phigenous ; mycelium web-like, fugacious or persistent ; con- 

 ceptacles minute, globose, scattered, or gregarious ; appendages 

 coloured, interwoven with the mycelium ; sporangia 8-16, shortly 

 pedicellate ; spores 4-8. — On leaves of Salsify, Scorzonera, 

 Plantain, &c. Autumn. Not uncommon. (Plate XII. tigs. 

 250, 251.) I have found but one or two sporangia. 



Erysiphe graminis, D.C. Grass Blight; amphigenous 

 or epiphyllous; mycelium effuse, floccose, persistent; couceptacles 

 large, gregarious or disseminated, hemispherical, at length de- 

 pressed and semi-immersed ; appendages simple or interwoven 

 with the mycelium; sporangia 20-24, ovate, pedicellate, with 

 8 spores. — On leaves of Grasses. Autumn. Frequent. (Plate 

 XI. figs. 235, 236.) 



Erysiphe Martii, Lk. Pea Blight ; amphigenous ; my- 

 celium web-like, very often evanescent, globose ; appendages short, 

 interwoven with the mycelium ; sporangia 4-8, globose, pedicel- 

 late, with 4-8 spores.— On leaves of Pease, Beans. Umbelliferce, 

 and other plants. Autumn. Very common. (Plate XL figs. 

 237-239.) 



Erysiphe Montagnei, Lev. Burdock Blight ; amphi- 

 genous or hypophyllous ; mycelium web-like, evanescent ; con 

 ceptacles minute, globose, gregarious or scattered; appendages 

 distinct from the mycelium ; sporangia 8, ovate, rostrate, with 

 2-3 spores. — On leaves of Burdock. Not uncommon. 



Erysiphe horridula, Lev. Borage Blight ; amphigenous; 

 mycelium web-like, sometimes persistent ; conceptacles minute, 

 globose, scattered or clustered ; sporangia 20-24, oblong-ovate, 

 attenuated downwards, containing 3-4 spores ; appendages short, 



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