THE FUNGI WHICH CAUSE PLANT DISEASE 487 



P. cinnamoni Del. on cinnamon leaves; 



P. hevea Zimm. on Para rubber. 



P. hortorum Speg.^*' " 



Spots circular, indefinite, fulvous, gray in the center, amphig- 

 enous, at last falling away; pycnidia in the center of the spot, 

 minute, 80-90 ju, globose-lenticular, thin, membranous, dull 

 fusco-olivaceous; conidia elliptic to ovoid, rounded at the ends, 

 4-6 X 2-2.5 fl- 

 it produces spots on leaves and fruit of egg plant in Europe 

 and America. 



P. chenopodii Sacc.'"' 



Spots irregular, scattered or confluent, ochraceous, fuscous 

 marked; pycnidia lenticular, punctiform, 50 /i; conida oblong- 

 elliptic, 5 X 3 /i- A leaf spot is produced on spinach. 



P. apii Hals.^* forms brown spots on leaves of celery; pycnidia 

 punctiform, black; conidia elliptic to ovate oblong. 



P. phaseolina Sacc. 



Spots irregularly scattered, subcircular, 2-10 mm., deep rusty 

 brown, becoming lighter in center and darker margined; pycnidia 

 scattered, 70-90 ju; conidia ovoid oblong, 4-6 x 2-2.5 n. 



It causes spotting of bean and cowpea.*^' 



P. cucurbitacearum Sacc. 



Spots epiphyllous or amphigenous, sordid, whitish; pycnida punc- 

 tiform, 80-100 jt», lenticular; conidia oblong, 5-6 x 2^ M, curved. 



On muskmelon, cucumbers and other cucurbs, spotting the 

 leaves. "■ ^i-^^ 



P. citrullina Chester '* is also reported on melons, "* 



P. maculicola Hals.^^ produces spots in Dracaena and related 

 plants. 



P. hedericola Dur. & M. and P. hederacea (Arc.) All. cause 

 spots on Hedera leaves,''^ **^ 



P. rosse Desm. and P. argillacese Bres. occur on roses. 



P. rosanun Pass, causes a black spot on roses in New South 

 Wales. 



P. althseina Sacc.'* 



Spots irregular, with a dark brown margin; pycnidia few, 

 lenticular, 90 m» ochraceous; conidia ovate-oblong, 6-7 x 3-4 ii. 



On hollyhock in Italy, France and America. 



