220 



THE LOWER FUNGI— PHYCOMYCETES 



and other Compositae. It is sometimes very destructive on 

 cultivated lettuce, especially in the greenhouse. The literature 

 on the genus is scanty. Recently several species have been 

 described from the Orient by Sawada (1919) and Tanaka (1919). 



Fig. "!). — Brcinia laclucuc Reg. Sijorangiophoro and sporangia {After Schwarze 



1917.) 



6. Bremiella Wilson (1914 h: 195). 



This is a monotypic genus based on Plasmbpara megasperma 

 Berlese (1903), occurring on violets. The branching of the 

 sporangiophore is typically dichotomous, each ultimate branch 

 being swollen at the apex to form an apophysis (Berlese, 1903 :^gr. 

 16). The sporangium is papillate and germinates by swarm- 



