388 THE FUNGI WHICH CAUSE PLANT DISEASE 



Table I 



HESULTS OF INOCULATIONS OF HELIANTHUS RUST* 



TelJospores taken from 

 H. mollis H. grosse- H. lasti- 



+ Abundant infection. — ■ Infection, but slow growth and few or no 

 sBcia formed, o No infection, a Not sown. 



P. violae (Schum) D. C"^ 



I. ^cia on the leaves in circular concave patches, often caus- 

 ing much distortion on the stems, flat with white torn edges. 

 Spores subglobose, finely verrucose, orange-yellow, 16-24 x 10-18 a*. 



II. Uredinia brown, small, roundish, scattered, soon naked. 

 Spores roundish or elliptical, brown, echinulate, 20-26 m in diameter. 



III. Telia black, roundish, small, pulverulent. Spores ellip- 

 tical or oblong, slightly attenuated at the base, with an apical 

 thickening, constriction almost absent, brown, 20-35 x 15-20 n. 

 Pedicels long, deciduous. 



An autdecious eu-type on many species of Viola, throughout the 

 world. Of little economic import. 

 P. convallariee-digraphidis (Sopli.) Kleb. is heteroecious; 

 I on Convallaria majalis. Ill on Phalaris. 

 * Adapted from Arthur. 



