APPENDIX. 221 



Erysiphe tortilis, Lk. Couxel Blight ; lij-popliyllous ; 

 mycelium web-like, effuse, evanescent ; conccptaclcs minute, glo- 

 bose; 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 ; hypo- 

 phyllous ; 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 oi various liammculacefB, Legiinii/iosre, and other plants. 

 Antumn. Yery common. (Plate XII. figs. 240—242.) 



CHiETOMIUM, Kze. 



Peritliecium tnin, brittle, mouthless ; sporangia linear, contain- 

 ing dark lemon-shaped spores. Berk, OutLy p. 405.| 



Chsstomiuni 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.) 



ChaGtomium 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.) 



Chsetomium. glabrum, B. 



This species has never been described. It was recorded, by 

 name only, in Berkeley's Outlines, and, the specimens being mis- 

 laid, that gentleman is unable to describe it completely and 

 correctly. "It grew abundantly on straw, and differed from 

 Chetomium elatum in being perfectly free from hairs." — (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 Cliife. (Plate Xil. 

 figs. 254-256.) 



