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.
Conceptacle with many sporangia.
Appendages needle-shaped, rigid Phyllactinia.
Appendages hooked Uncinula.
Appendages dichotomous Microsphæria.