APPENDIX. 237 



Peronospora violacea, Berk. Scabious Mould; fertile 

 threads branched ; acrospores sub-elliptical, violet-coloured. 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. 1 have not found it again, and have either 

 lost or mislaid my specimens. You may describe is as late 

 violacea; floccis ramosis ; sports subellipticis, violaceis. It is 

 probably the Farinaria on Scabious of Sowerby." (M. J. B.) 



Peronospora sordida, Berk. Eig-wort Mould ; forming 

 broad, irregular, dirty, pallid spots on the under surface cf the 

 leaves ; fertile threads loosely dichotomous above ; tips forked, 

 unequal ; acrospores obovate, apiculate. — On leaves of Scrophic- 

 laria. Jed burgh. 



Peronospora Candida, Fucker. Primrose Mould; 

 densely csespitose, white ; threads erect, dichotomously branched ; 

 ultimate brauchlets short, spreading; sporidia ovate. — On leaves 

 of Primrose. Near Corwen, N. Wales. July, 1866. 



Peronospora sparsa, Berk. Hose Mould; fertile 

 threads scattered, by no means torulose, ultimate branches 

 scarcely uncinate, dichotomous, pallid grey; acrospores sub- 

 elliptical.— On the under side of Rose-leaves in conservatories. 



Peronospora obliqua, Cooke. Dock Mould; threads 

 of the mycelium slender ; fertile threads fasciculate, erect, simple, 

 rarely bifurcate, attenuated upwards ; acrospores large, ellipsoid, 

 attached obliquely near the base.— On the under surface of Dock 

 leaves. Winter and spring. Probably not uncommon. Brownish 

 circular spots on the leaves indicate the presence of this mould, 

 which is so minute that it might otherwise be overlooked. 

 (Plate XVI. fig. 2G9.) 



Peronospora interstitialis, B. and Br. Spots hypo- 

 phyllous, yellow, confined to the interstices of the veins, or very 

 rarely extending slightly beyond them ; flocci very short, flexuous ; 

 acrospores terminal, ovate, often seated obliquely.— On leaves of 

 Primrose. 



Peronospora runbasis, B. and Br. Epiphyllous, spots 

 shining ; tawny, pallid on the opposite surface; flocci linear ; 

 acrospores obovate or elongated, variable, obliquely attached, 

 very shortly pedicellate. — On leaves of Myrica Gale. 



The last three are probably species of Ramuluria. 



