72 Forty-third Annual Report on the 



Plasmodiophora Brassicee, Wor. 



Roots of cabbage, Brassica oleracea. Meuands. October. . 



This fungus causes swellings or excrescences in the roots of the 

 host plant. These swellings have received the common name 

 " club-root." Cabbages attacked by this disease fail to perfect their 

 heads. The affected roots should be taken from the ground and 

 burned in order to destroy the fungous spores they contain. It has 

 been recommended that the ground should not again be planted with 

 cabbages or other plants of the Mustard family until after the lapse of 

 two or three years, in order that the germs of this disease, which may 

 be in the soil, may have time to perish. In the meantime other crops 

 may occupy the land- 



Phyllosticta bicolor, n. sp. 



Spots rather large, two to six lines broad, irregular, at first brown, 

 then centrally whitish, with a broad brown margin, brown beneath; 

 perithecia epiphyllous, occupying the whitish or central part of the 

 spots, minute, .004 to .005 in. broad, black; spores minute;, oblong, 

 colorless, .0002 to .00025 in. long, .00008 to .0001 broad. 



Living leaves of thimbleberry, Rubus odoratus. Whitehall. August. 



Phyllosticta Prini, n. sp. 



Spots small, suborbicular, white or grayish above, brownish beneath; 

 peiithecia small, .007 in. broad, epiphyllous, depressed, black; spores 

 elliptical or oblong, .0003 to .0005 in. long, .00016 broad. 



Living leaves of winterberry, Ilex veHicillata. Catskill mountains. 



September. 



Phyllosticta Silenes, n. sp. 



Spots large, sometimes occupying half the leaf, pallid; perithecia 

 amphigenous or hypophyllous, minute, punctiform, black; .004 to 

 .005 in. broad; spores oblong or cylindrical, colorless; .0004 to .0005 

 in. long, .00015 to .0002 broad. 



Living leaves of sleepy catclifly, Silene antirrhina. Copake Iron 



Works. June. 



Phyllosticta Caricis, Sacc. 



Living leaves of Pennsylvanian sedge, Garex Peniisylvanica. Cats- 

 kill mountains. September. 



Phoma allantella, n. sp. 

 Perithecia subglobose, subsuperficial, .007 to .008 in. broad, black; 

 spores minute, allantoid, .00016 to .0002 in. long, about halt as broad. 

 Whitened decorticated wood of oak, Quercus rubra. Catskill 



mountains. September. 



