165 



This pest which had scarcely been known before 1907 when it was 

 found in France, spread all over Europe in 1908 and also occurred in 

 several places in Denmark in the same year, for instance near Red- 

 kaersbro (Aug. 7. 08 Moldenhawer) ; since then it has reappeared every 

 year in great abundance, the first set of leaves are scarcely affected, 

 but the leaves and shoots produced in summer are most frequently 

 quite white from the attack of this fungus; it seems to hibernate in 

 the buds. 



It is most common on Quercus robur, rarer on Quercus sessiliflora and 

 Quercus coccinea. On Fagus silvatica it is found on suckers. 



621. Oidium violae Passer., Syll. IV", Ldau VIIP=. 



On Viola tricolor, Rostrup records a very destructive attack (R 76 b '"' 6^ 

 88 n "6). 



622. Oidium eucalypti Rostrup ad interim 02 a *^^. 

 On seedlings of Eucalyptus, S. Botanisk Have Nov. 88. 



623. Oidium oxalidis Mac Alp. 



Oxalis cult, in a hothouse. S. Lundehuset (^'/i2 10!). 



624. Oidium evonymi-japonici (Arc.) Sacc, Syll. XVIII, Ldau 

 IX ™, Salmon 05 c. icon. 



On leaves of Evonymus japonicus. S. Tystofte C/t 07 ! ). 



625. Oidium valerianellae Fuckel, Syll. IY'\ Ldau VIII". 



Its attacks cause hypertrophies and an ampler ramification (see R 85 a). 

 On leaves and stems of Valerianella olitoria &. Morisonii. 



Perisporiaceae. 



Anixia. 



626. Anixia spadicea Fuckel, Syll. I ^\ Wt. II " c. icon. 

 On dung of mammals, decaying leaf etc. (Hansen 76 ^^''). 



Asterina. 



627. Asterina veronicae (Lib.) Cooke, Wt. II ^\ Schroeter 08 '", 

 Syn: Dimerosporium abjectum (Wallr.) Fuckel, Syll. I ^\ 



On living leaves of Veronica officinalis. May— October. J. Bruddal!, Thors- 

 ager!, F. Brudager O^/io 73); S. Jonstrup Vang; B. Ekkodalen (R 06 dd). 



Lasiobotrys. 



628. Lasiobotrys lonicerae (Fries) Kze., Syll. I '", Wt. II ™ c. icon., 

 Syn: Dothidea Ion. Fries S. M. IP". 



On living leaves of Lonicera xylosteum. Meen Nordfelt (^s/sOgl). 



