524 THE FUNGI WHICH CAUSE PLANT DISEASE 



S. oleandrina Sacc. In leaf spots of oleander. 



S. veronicae Desm. 



Spots amphigenous, small, subrotund, brownish or grayish, 

 becoming white, border umbrinous; pycnidia epiphyllous, glo- 

 bose, prominent, pale brownish-black; conidia elongate, slender, 

 straight or flexuose. 



It is parasitic on cultivated Veronicas.^* 



S. caraganse Hen. is on Caragana. 



S. ochroleuca B. & C. 



Spots scattered, suborbicular, pale, brown margined; pycnidia 

 central, minute, scattered, hypophyllous, pale, collapsing; conidia 

 fusoid-filiform, curved, continuous or 1-septate, 25 m long. 



In leaf spots on chestnut. 



S. castanicola Desm. and S. castanea Lev. are on chestnut; 

 S. nigro-maculans Thiim. on walnuts and horse-chestnut; 



S. sesculi Lib. and S. hippocastani B. & Br. on horse- 

 chestnut. 



S. pseudoplatini R. & D. occurs on sycamore and maple; 



S. frazani Desm. on ash; 



S. cercidis Fr. on Cercis; 



S. tiliae West, on TiUa; 



S. curvata (R. & B.) Sacc. on Robinia leaves. 



S. spadicea P. & C.^*^ causes a common twig blight of 

 pine. 



Pycnidia not spot-forming, late, becoming slightly erumpent 

 on inner surface of browning needles, scattered, membranous, 

 fuscous-olivaceous, subimmersed, 190-225 /i in diameter. Spores 

 hyaline, cyhndrical, slightly curved or flexuous, apex acute, 

 1-septate, rarely constricted at septum, 3-4 x 30-45 m- Conidio- 

 phores short. 



S. ulmaris Oud. Pycnidia minute, inmiersed, spores cylindric, 

 curved, hyaline, continuous, 5.0 x 2.5 n. On Spirea. 



S. comicola Desm. 



Spot orbicular, margin dark purple; pycnidia- epiphyllous, few, 

 black; spores cylindric, curved, 35-10 x 2-2.5 n, obsolete 2 to 4- 

 septate, hyaline. On Comus. 



S. parasitica Hart, is found on young spruce buds killing the 

 lateral shoots. 



