Australian Fungi. 221 



Group XT. — PhycoiMycetes. 



ORDER PERONOSPORACE^. 



(25) Peronospora parasitica., De Bary., var. Lepidii, McAlp. 



Dense white mould on leaves and other parts of plant, which 

 soon curl, and the fungus forms a felt almost covering the entire 

 surface. 



Gonidiophoi'es straight, averaging G/a thick. Gonidia elliptical, 

 pale grey, 35 — 41/* x 19 - 22^ ; membrane about 1/a thick, 

 hyaline, protoplasm granular, with a homogeneous layer between 

 it and membrane, germ-tube issuing laterally. 



On leaves, stems and fruit of Lepidium ruderale, causing 

 distortion. The lower surface of leaf is attacked first, causing it 

 to curl up. After autumn rains and in spring. Ardmona, in 

 Goulburn Valley, Victoria (Robinson, 108). 



The variety principally differs from P. parasitica in the stalk 

 of the gonidiophore being straight and not flexuous, and in the 

 shape and size of the gonidia, being sometimes twice as long as 

 broad, and altogether larger. 



(26) Peronospora Schleideni, linger. 



Common on leaves of onion, shallot, and various species of 

 AUiuni. Victoria. 



ORDER ENTOMOPHTIIORACE^. 



(27) Euipiisa AIusccc, Cohn. 

 On dead house flies ( Alusca doinestica). Victoria. 



Group XII. — ^Myxomy'cetes. 



(28) Plasniodiophora Brassicce, Wor. 



Causing " club-root " in turnips, cabbages, cauliflower, and 

 other cruciferous plants. Victoria. 



