MTJCEDINES. 597 



violet-colour. — Cooke Micr. Fung. t. 13,/. 263. Pop. Sc. Rev. iii. 

 t. 8,f. 2. De. Bary.Ann. Sc.Nat. (1863), xx. t. 13,/. 1-3. Botrytis 

 destructor, Berk. Ann. N.H. no. 239, t. 13,/. 23. Fckl. exs. no. -41. 



On leaves of various species of Allium. Spring. 



Very common and destructive in some years, preventing the plants which, 

 are attacked from coming to perfection. The individual threads are distinct, 

 but form large patches on the leaves, or even entirely cover them. Dis- 

 tinguished easily by the peculiar shape of the acrospores. 



1788. Peronospora violacea. Berk. " Scabious Peronospora." 



Fertile threads branched ; acrospores snb-elliptical, violet- 

 coloured. — Berk. Outl. p. 3-49. Cooke Micr.Fung.p. 217. 



On petals of Scahiosa arvensis. 



All that is known of this species is contained in the following note from the 

 Rev. M. J. Berkeley : — " It grew on the petals of the common scabious. I 

 have not found it again, and have either lost or mislaid my specimens. You 

 may describe it as Icete violacea ; fioccis ramosis ; sjjoris suhellipticis^ violaceis. 

 It is probably the Farinaria on Scabious of Sowerby.' — M.J.B. 



1789. Pexonospoxa sordida. Berh. "Figwort Peronospora." 



Forming broad, i-regular, dirty, pallid spots on the under 

 surface of the Idaves ; fertile threads loosely dichotomous above, 

 tips forked, unequal ; acrospores obovate, apiculate. — B. ^ Br. 

 Ann. N.H. no. 953. Cooke Jlkr. Fung. p. 217. Cooke exs. no. 291. 



On leaves of Scrophularia. 



Forming broad, irregular, dirty, pallid spots on the under side of the 

 leaves ; threads loosely dichotomous above ; tips forked, unequal ; acros- 

 pores obovato apiculate (•(JOl in.) "025 m.m. long. 



1790. Peronospora sparsa. Berk. " Rose Peronospora." 



Fertile threads scattered, by no means torulose ; ultimate 

 branches scarcely uncinate, dichotomous, pallid grey ; acro- 

 spores sub-elliptical. — Berk. Gard. Chron. 1862,/). 308, Jig. Ann. 

 N.H. 1865, no. 1057. Cooke Micr. Fung. p. 217. 



On the under side of rose leaves. 



1791. Peronospora obliqua. Coohe. " Dock Peronospora." 



Threads of the mycelium slender; fertile threads fasciculate, 

 erect, simple, rarely bifurcate, attenuated upwards ; acrospores 

 large, ellipsoid, attached obliquely near the base. — Cooke Micr. 

 Fung. 1. 16, /. 269. B. ^ Br. Ann. N.H. no. 1058. Cooke exs. 

 no. 195. Ascomyces Rumicis, Mont. 



On the under surface of dock leaves. Winter and spring. 

 Common. 



