30 



GENUS 315. PHYLLACTINIA.* Liv. 



Parasitic. Perithecia hemispherical, at length depressed, seated 

 on a persistent or evanescent membranaceo — granular receptacle. 

 Appendages straight, rigid, acicular, at length bent back. 

 Phyllactinia guttata Fr. On various leaves, Batheaston, common. 



GENUS 316. UNCINULA.t L6v. 



Mycelium floccose. Perithecia globose. Appendages rigid, 

 simple, bifid or dichotomous, uncinate, at length bent upwards. 

 Uncinula adunca Lev. On poplar and other leaves, common. 



XJ bicornis Lev. On maple leaves and other leaves, 



common. 



GENUS 317. MICROSPHiEKA. I Lev. 

 Mycelium arachnoid. Appendages straight, dichotomous. 

 Branchlets swelling at the tip, or filiform. 

 Microsphsera penicillata Lh. Bathford, September, on hazel. 



GENUS 318. ERYSIPHE.§ Bedw. 

 Mycelium arachnoid. Appendages floccose, simple, or irregularly 

 branched. 

 Erysiphe tortilis Lev. Eudlow, September, common. 



E communis Schlecht, on various leaves. 



E macularis Fr. Batheaston, July, on hops. 



GENUS 319. Cephalotheca.|| Fell. 

 Symb. Mycol. der theinischen Pilze. 

 Perithecia simple, free, carbonaceous, very fragile, composed of 



* Phyllactinia, from phuUon, a leaf, and aktin, a ray or spoke of a wheel 



t Uncinula, from uncinus, a hook. 



% Microsphsera, from micros, small, and sphaira, a sphere. 



§ Erysiphe, from Eryslbe, mildew. 



II Cephalotheca, from cephalos, a head, and theke, a receptacle. 



