MILDEWS, RUSTS AND SMUTS 
33 
Syn. Botrytis viciae, Berk. 
Protomyces reticulatus, Sacc. 
Parasitic on the leaves of leguminous plants as Vida 
sepiicm, V. hirsuta, V. teirasperma, V. cracca, V. saliva, 
Pisum sativum, Lathyrus pratensis, Orobus tuberosa, Meli- 
lotus officinalis. Ononis spinosa, etc. 
Peronospora affinis, Rossm. Patches dense, effused, 
greyish-lilac ; conidiophores tufted, 250—300 x 9—ii p,, 
5—7 times forked above, lower branches spreading, some¬ 
times curving inwards, or towards each other ; conidia 
elliptical, 20—27 X 12—18 p,, pale lilac ; oosphere with a 
thick, yellowish wall; oospore subglobose, wall yellowish- 
brown, smooth, 32—35 p, diam. 
Parasitic on leaves of plants belonging to the order 
Fumariaceae as Fumaria officinalis. 
Peronospora lamii, A. Braun. Forming lax or dense, 
effused, greyish-lilac patches ; conidiophores often pro¬ 
duced singly, 250—650 X 8—9 p., 5—7 times forked above, 
branches tapering upwards, more or less curved, ultimate 
branches often elongated and tapering to a point ; conidia 
broadly elliptical, with a short, persistent stalk, 17—24 
X 15—20 [JL, pale dingy lilac ; oospores subglobose, with 
a thin, smooth, brown wall, 28—30 p. diam. 
Syn. Peronospora calaminthae, Fuckel. 
Parasitic on the under surface of leaves of plants belonging 
to the order Labiatae, as Lamium album, L. purpureum, 
L. rubrum, L. amplexicaule, L. maculatum, Salvia pratensis, 
Stachys palustris. Thymus and Calamintha, etc. 
Often forming broadly effused felt-like patches on the 
under surface of the leaves. 
Peronospora sordida, Berk. Forming dense, effused, 
dingy greyish-lilac patches ; conidiophores tufted, 350— 
550 X 8—10 p,, lower unbranched portion elongated, 
dividing above into 3—8 main branches, which become 2— 4. 
times irregularly forked, often more or less curved down¬ 
wards, ultimate branchlets short, tapering to a point, curved; 
conidia broadly elliptical, 24—^28 x 18—22 p., with a very 
faint lilac tinge, or colourless. 
Parasitic on the under surface of the leaves of plants 
belonging to the order Scrophulariaceae, as Scrophularia 
aquatica, S. nodosa, S. altaica, Verbascum thapsus, V. 
blattaria, V. thapsiforme, V. nigrum, V. virgatum, Digitalis 
purpurea, etc. 
D 
