APPENDIX. 235 



Peronospora Vicise, Berk. Pea Mould ; fertile threads 

 densely csespitose, erect, equal, rarely unequal, 6-7-S times 

 dichotomous ; ultimate ramuli shortly subulate, acute ; acrospores 

 ellipsoid, very obtuse at the apex, obtuse or slij?htly acute at the 

 base ; membrane with a violaceous tint. — On Tares, Pease, &c. 

 Prequent. (Plate XV. fig. 266 ; plate X. fig. 212.) 



Peronospora Arenarise, Berk. Sandwort Mould; 

 fertile threaus slender, 6-7 times equally, rarely unequally, 

 dichotomous; branches spreading; ultimate ramuli slender, 

 acute, subulate, nearly erect ; acrospores broadly elliptical, often- 

 times very obtuse, small ; membrane scarcely violaceous.— On 

 Arenaria serpyllifolia and A. trinervis. June. (Plate VI J. fig. 

 268 ; plate X. fig. 211.) 



Peronospora efiusa, Grev. Spinach Mould; fertile 



threads fasciculate, short, thick. 2-6, rarely 7 times dichotomous 

 above ; acrospores broadly ellipsoid, sometimes very obtuse ; 

 membrane with a violaceous tint. — On Spinach, Goosefoot, and 

 some other allied plants. Spring and autumn. Not uncommon.. 

 (Plate X. figs. 214, 215.) 



Peronospora Violee, De Bary. Violet Mould ; effuse ; 

 flocci fasciculate, rather short, 2-6 times dichotomous ; ultimate 

 ramuli shortly subulate, deflexed ; conidia ellipsoid, shghtly 

 apiculate. — On living leaves of Violet. 



Peronospora Urticse, Gasp. Nettle Mould ; fertile 

 threads small, loosely 4-6 times dichotomous ; branches flexuose, 

 ultimate ramuli subulate, arcuate, often deflexed; acrospores 

 large, broadly ovoid or subglohose, distinctly pedicellate ; apices 

 very obtuse ; membrane violaceous.— On leaves of the common 

 Nettle. 



Peronospora Ficarise, Tul. Pigwort Mould; fertile 

 threads 5-6 tnues dichotomous, ultimate and penultimate ramuli 

 arcuate and deflexed, ultimate subulate ; conidia broadly ellipsoid, 

 obtuse ; epispore pale violet-tinted ; oospores havms: the epispore 

 of a pallid yellowish-brown.— On Uammculus Ficaria and R. 

 repens. Porden. May. 



Peronospora Lamii, De By. Dead-Nettle Mould; 

 fertile threads short, 5-7 times dichotomous, branches attenuated, 

 patent, all more or less arcuate, ultimate ramuli acute ; conidia 

 distinctly pedicellate, globose-ovoid, obtuse ; epispore pale dull- 

 violet tint; oospores small, brown.— On Lamiumrubrnm. Porden. 

 May. Tufts dense, forming grey spots on the under surface of 

 the leaves. 



