164 



var. grossulariae Fries S. M. Ill ''*\ Stikkelsbsrmeldug (Dybdahl 79 ^"^ 

 R02a"^), Europsisk Stikkelsbsrmeldug (Lind & Ravn 10^^). 

 On Ribes grossuhria, common (see R 80 a '''"', 86 h '"'3). 



Uncinula. 



611 Uncinula adunca (Fries) Lev., Syll. I ^ R 80 a "^ Syn: Ery- 

 siphe ad. Fries S. M. Ill ="=, Uncinula salicis Wt., I \ Salmon 00 =\ 

 Pilens Meldug (R 02 a "^^ & 04 a "«). 



On Salix amygdalina, alba X fragilis, caprea, caprea X cinerea, vepens. Po- 

 pulus nigra &. var. pyramidalis. Aug.— Octob. 



615. Uncinula bicornis (Fries) Lev., Syn: Erysiphe bic. Fries S. 

 M. Ill ^■'\ Uncinula aceris Sacc, Syll. I ', Salmon 00 ^o, Oidium aceris 

 Rbh., Syll. IV ^^ Ldau VIII '\ Lennens Meldug (R 02 a "^'^ & 04 a "«). 



Common on the leaves of Acer campestre &. pseudoplatanus (R 80 a ''^'). 



616. Uncinula Tulasnei Fuckel, Syll. I ^ Er. 85 "^ Syn: Unc. aceris 

 var. Tulasnei Salmon 00'^. 



Common on the leaves of Acer plafanoides. 



617. Uncinula prunastri Sacc, Syll I ', Salmon 00 ^^ Syn: Erysiphe 

 adunca var. prunastri Fries S. M. Ill ''^^. 



On the leaves of Prunus spinosa (R 80 a ''^'). 



618. Uncinula necator (Schweinitz) Burrill, Salmon 00 *', Syn: 

 Erysiphe nee. Schw. Syll. I ^', Er. Tuckeri Berk., Syll. 1 ^"j Oidium Tu- 

 ckeri Berk., Druesvampen (R 82 b =), Vinstokkens Meldug (R 02 a *^'^y 



This pest, which has been known in England since 1845 and in 

 France since 1848, first appeared in Denmark in 1857 in the garden 

 of Rosenborg (see Hoist 57 &. Vaupell 58), since then it has spread 

 all over the country causing great damage both in hothouses and on 

 wall-vines. 



Phyllactinia. 



619. Phyllactinia guttata (Fries) Leveille, Syn: Erysiphe gut. 

 (Walk.), Fries S. M. Ill ^■'^ Phyllactinia suffulta (Reb.) Sacc, Syll. I \ 

 Phyl. corylea (Pers.) Karst., Salmon 00, Sclerotium erysiphe Schum. 

 no 1390, Hasselens Meldug (R 02 a "^^ fi. 04 a "'). 



Common on the under surface of leaves of Betula verrucosa 6v pubescens, 

 Alnus glutinosa &. incana, Corylus avellana &. americana. Carpinus betulus, 

 Fagus silvatica, Fraxinus excelsior &. ornus. 



Oidium. 



620. Oidium quercinum Thiimen, Syll IV^\ Ldau IX ^^\ Syn: 

 Old. querc. var. gemmiparum Ferraris. Ldau IX ^^^ 



