=Erysiphe Martii=, Lk. PEA BLIGHT; amphigenous; mycelium web-like, very often evanescent, globose; appendages short, interwoven with the mycelium; sporangia 4-8, globose, pedicellate, with 4-8 spores.—On leaves of Peas, Beans, _Umbelliferæ_, and other plants. Autumn. Very common. (Plate XI. figs. 237-239.) =Erysiphe Montagnei=, Lév. BURDOCK BLIGHT; amphigenous or hypophyllous; mycelium web-like, evanescent; conceptacles 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 tortilis=, Lk. CORNEL BLIGHT; hypophyllous; mycelium web-like, effuse, evanescent; conceptacles minute, globose; appendages ten times as long, free from the mycelium, flexuose; sporangia 4, ovate, rostrate, with 4 spores.—On leaves of the common Dogwood. Autumn. Frequent. (Plate XII. figs. 245, 246.) =Erysiphe communis=, Schl. BUTTERCUP BLIGHT; hypophyllous; mycelium effuse, web-like, evanescent or persistent; conceptacles minute, globose, scattered or gregarious; appendages short; sporangia 4-8, ovate, rostrate, with 4-8 spores.—On leaves of various _Ranunculaceæ_, _Leguminosæ_, and other plants. Autumn. Very common. (Plate XI. figs. 240-242.) CHÆTOMIUM, _Kze._ Perithecium thin, brittle, mouthless; sporangia linear, containing dark lemon-shaped spores. _Berk. Outl._, p. 405. =Chætomium elatum=, Kze. STRAW-BRISTLE MOULD; perithecium sub-ovate, base radiato-fibrose, hairs of the vertex very long, interwoven, branched; spores broadly elliptic, apiculate at either end.—On mouldering straw, reeds, matting, &c. Very common. (Plate XII. figs. 257-259.) =Chætomium chartarum=, Ehb. PAPER-BRISTLE MOULD; perithecium subglobose, black, surrounded by a bright yellow spot; spores subglobose.—On paper. Stibbington, Hants. Rare. (Plate XII. figs. 252, 253.) =Chætomium glabrum=, B. This species has never been described. It was recorded, by name only, in Berkeley’s Outlines, and, the specimens being mislaid, that gentleman is unable to describe it completely and correctly. “It grew abundantly on straw, and differed from _Chætomium elatum_ in being perfectly free from hairs.”—(_M. J. B._)—On damp straw. ASCOTRICHA, _Berk._ Perithecium thin, free, mouthless, seated on loose, branched, conidiiferous threads; sporangia linear, containing dark elliptic spores.—_Berk. Outl._, p. 405. =Ascotricha chartarum=, B. PAPER MILDEW; perithecium thin, olive-brown, seated on radiating flocci; sporangia linear, numerous; spores broadly elliptic, chocolate-coloured.—On white printed paper in a deal candle-box. King’s Cliffe. (Plate XII. figs. 254-256.) EUROTIUM, _Link._ Perithecia reticulated, vesicular, coloured, attached to mucedinous threads; sporangia delicate.—_Berk. Outl._, p. 405.