THE FUNGI WHICH CAUSE PLANT DISEASE 489 



P. pteridis Hals, causes blighting of cultivated Pteris; ^^ 



P. narcissi Aderh. of narcissus.'" 



P. cavarse Trinch. produces white spots on leaves of Anthurium.^' 



P. dracsnse causes spots on Dracaena leaves. 



P. funckia Hals. Pycnidia 75-150 n, straw colored. 



The cause of leaf spots of cultivated Funkias."^ 



P. dammarse is found on Dammar a in Italy; 



P. nobilis Thiim. on Laurus. 



P. ulmicola Sacc. 



Spots indefinite, ochraceous, margin concolorous; pycnidia gre- 

 garious, punctiform, 70-80 n, lenticular; conidia oblong ellipsoid, 

 6-3 M- It infests elm leaves.^* 



P. acericola C. & E.'^ 



Spots irregular, fuscous, brown margined; pycnidia densely 

 scattered on the central part of the spot, subepidermal, flask- 

 shaped, dark brown, 120 n; conidia ovate, 8-9 x 5-6 ju. 



It causes serious leaf spotting of maples throughout the United 

 States. 



P. aceris Sacc. forms small spots on maple leaves. 



P. paviae Desm. 



Spots indeterminate, reddish, lighter margined; pycnidia 

 epiphyllous, black; conidia cylindric-elliptic, 11-12 fi long. It 

 is said to be common on jEsculus.^* 



P. sphseropsidea E. & E.'* 



Epiphyllous; spots reddish-brown, margin lighter, scattered 

 or confluent, 1-2 cm.; pycnidia scattered, immersed, punctiform, 

 erumpent above, subepidermal; conidia globose to broadly ellip- 

 soid, hyaline, 12-15.5 x 8-10 /x. 



It causes serious leaf spotting of chestnuts throughout the 

 United States. 



P. tiliae Sacc. & Speg. is found on Tilia. 



P. minima (B. & C) E. is on Negundo. 



P. catalpse E. & M. 



Spots, rounded, brown, 3-6 mm., often confluent; pycnidia 

 subcuticular, small, black, scattered, 112 x 84; conidia ovate, 6-7 x 

 2.5-4^5 II. It causes leaf spots on Catalpa.'* 



P. magnolise Sacc. causes leaf spots On Magnolia; P. viridis E. & 

 K. on ash; P. ilicina Sacc. on the cork oak. 



