APPENDIX. 235 



Peronospora Vioise, Berk. Pea Mottld ; fertile threads 

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

 diohotomous ; ultimate ramuli shortly subulate, acute ; acrospores 

 ellipsoid, very obtuse at the apex, obtuse or sMghtly acute at the 

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

 Frequent. (Plate XV. fig. 266 ; plate X. fig. 213.) 



Peronospora Arenarise, Berk. Sandvort Mould; 

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

 diohotomous ; branches spreading ; ultimate ramuli slender, 

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

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

 Arenaria serpyllifoUa and A. trinervis. June. (Plate VII. fig. 

 268 ; plate X. fig. 211.) 



Peronospora effasa, Grev. Spinach Mould; fertile 

 threads fasciculate, short, thick, 3-6, rarely 7 times diohotomous 

 above; acrospores broadly ellipsoid, sometimes very obtuse; 

 membrane with a violaceous tint. — On Spinach, (Soosefoot, and 

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

 (Plate X. figs. 214, 315.) 



Peronospora Violee, De Bary. Violet Mould ; effuse ; 

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

 ramuli shortly subulate, deflexed; conidia ellipsoid, slightly 

 apiculate. — On living leaves of Violet. 



Peronospora TJrticae, Gasp. Nettle Mould; fertile 

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

 ultimate ramuli subulate, arcuate, often deflexed: acrospores 

 large, broadly ovoid or subglobose, distinctly pedicellate ; apices 

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

 Nettle. 



Peronospora Ficarise, Tul. Pigtvobt Mould ; fertile 

 threads 5-6 times diohotomous, ultimate and penultimate ramuli 

 arcuate and deflexed, ultimate subulate ; conidia broadly ellipsoid, 

 obtuse; epispore pale violet-tinted; oospores having theepispore 

 of a pallid yellowish-brown. — On lianunculus Ficaria and B. 

 repens. Porden. May. 



Peronospora Lamii, l)e By. Dead-Nettle Mould; 

 fertile threads short, 5-7 times diohotomous, 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 Laminmrubrum: Porden. 

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

 the leaves. 



