=Peronospora grisea=, Ung. VERONICA MOULD; fertile threads erect, fasciculate, grey, 5-7 times regularly dichotomous; branches gradually attenuated; primary oblique erect; others spreading, flexuose; ultimate mostly unequal, slightly arcuate; acrospores ellipsoid or ovoid, obtuse; membrane pale and dirty violet.—On leaves of _Veronica beccabunga_. May, 1846. (Plate X. fig. 213.) =Peronospora arborescens=, Berk. POPPY MOULD; fertile threads slender, erect, 7-10 times dichotomous above; branches more or less flexuose, squarrose, spreading, gradually attenuated; ultimate ramuli shortly subulate, more or less arcuate; acrospores very small, subglobose; membrane scarcely violaceous.—On the Corn Poppy. June. Common. =Peronospora Schleideniana=, De By. (_P. Destructor_, B.) ONION MOULD; fertile threads robust, erect, not septate, branched alternately; ultimate ramuli forked and uncinate or divaricate; acrospores seated on the tips of the ultimate ramuli, obovoid or nearly pear-shaped, attenuated at the base; membrane of a dirty violet-colour.—On the leaves of various species of _Allium_. Often plentiful. (Plate XIII. fig. 263.) =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. I have not found it again, and have either lost or mislaid my specimens. You may describe it as _læte violacea_; _floccis ramosis_; _sporis subellipticis_, _violaceis_. It is probably the _Farinaria_ on Scabious of Sowerby.” (M. J. B.) =Peronospora sordida=, Berk. FIGWORT MOULD; forming broad, irregular, dirty, pallid spots on the under surface of the leaves; fertile threads loosely dichotomous above; tips forked, unequal; acrospores obovate, apiculate.—On leaves of _Scrophularia_. Jedburgh. =Peronospora sparsa=, Berk. ROSE 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. 269.) =Erysiphei=. _Conceptacle with one sporangium._ Appendages floccose _Sphærotheca_.