64 



61. Peronospora corydallis de By., Syll. VII "", Fisch. IV *'\ 

 Syn: Per. bulbocapni Beck, Syll. VII 2«^ Laerkesporeskimmel (R04a ^^). 



A. Fischer unites Per. corydallis and bulbocapni while Saccardo 

 considers them separately. F. Bubak has subjected them to a renewed 

 examination (03) and considers them well separated species, while O. 

 Jaap (10 ^) again will unite them. I have examined the material in 

 hand, but I can find no constant dififerences between the two supposed 

 separate species, the length of the conidies of all the specimens exa- 

 mined varies between 20 and 28 M and their width between 15 and 

 24 M . Rostrup (04) even unites them with Per. affinis. 



Corydallis cava. F. Bjernemose, Vejstrup Aaskov ("/5 71), V. Skerninge (Jak. 

 Lge); S. LeIIinge (C. H. O.), Naesbyholm, Hammer!, Oringe (Gad); B. Sva- 

 neke (Exc. ''^/s 11). Corydallis intermedia. J. Krabbesholm Skov!, F. Klingstrup, 

 Vejstrup Aaskov, Skaarup. S. Ermelunden (O. R.). Corydallis pumila. S. Char- 

 lottenlund ("A 84 and again ^/b 96). 



62. Peronospora parasitica (Fries) Tulasne, Syn: Botrytis para- 

 sitica Fries S. M. Ill '"'^ Korsblomsternes Bladskimmel (R 93 c ^'), Kors- 

 blomstskimmel (R 02 a ^"^ fi. 04 a '«). 



Its attack often causes some deformation of the host-plant especially 

 of Matthiola and Cheiranthus. Rostrup also records (85 a) a single 

 specimen of Erophila verna which was so stimulated by the attack 

 of the fungus that it produced 70 flowers. 



The fungus also causes damage to the gardens by affecting the 

 seedlings of Brassica. It may be found almost all the year round, 

 often in company with Cystopus candidus. 



Erophila verna common. Cochlearia danica. F. Magaard. Roripa armoracia 

 common. Camelina linicola. J. Sahl (Th. Leth), Thorsager; S. Lyngby (M. L. M.); 

 L. Stensgaard. Capsella bursa pastoris common. Lepidium ruderale. S. Masned- 

 sund. Cardamine amara. J. Viborg!; F. Skaarup. Dentaria.bulbifera. J. Skovs- 

 gaard by Viborg!, Kale Hestehave (J. Christensen Hygum); F. Bjernemose; 

 Meens Klint ("!& 97 C. H. O., May 99 Ferdinand, i^/e 09!); B. Gudhjem (Exc. 

 ■"5/5 11). Turritis glabra. F. Skaarupor; S. Hammer!. Arabis hirsuta (hosp. nov.). 

 J. Vivebrogaard ! . Stenophragma thalianum. F. Skaarup, Svenborg. Alliaria 

 officinalis. F. Vejstrup Aaskov. Barbarea lyrata. F. Ringe ! . Erysimum Cheiran- 

 thoides. F. Lammehave. Sisymbrium officinale. J. Skive ! , Fannerupgaard ; S. 

 Kebenhavn. Brassica campestris. J. Mariager; Samse; S. Kebenhavn. Brassica 

 napus. J. Sevel; F. Magaard; S. Landbohejskolens Mark. Brassica oleracea 

 common. (R 81 a S'' a 98 p). Sinapis alba. S. Lyngby (M. L. M.). Sinapis arven- 

 sis. S. Damhuset; L. Stensgaard. Cheiranthus cheiri. J. Aarhus (Vilh. Petersen); 

 S. Kobenhavn!. Matthiola annua. S. Kebenhavn, Glostrup; L. Nakskov. Ra- 

 phanus sativus. S. Kabenhavn; Amager. 



63. Peronospora crispula Fuck., Syll. VII ^*°. 



Is considered by A. Fischer to be identical with the preceding spe- 

 cies. May— August. 



Reseda luteola. F. Svenborg; L. Nerregaard (i^/s 77); B. Svaneke (R 06 dd ^^s). 



