558 THE FUNGI WHICH CAUSE PLANT DISEASE 



Conidia oblong, not rostrate 



Conidia cirrhose protruded. . . 3. Stilbospora. 



Conidia not protruded 4. Coryneum, p. 560. 



Conidia stellate-lobed, lobes several- 

 septate 5. Asterosporium 



Conidia in chains 

 Conidia connected with filiform isthmi 6. Seiridium. 



Conidia chains without isthmi 7. Seiridiella. 



Conidia ciliate 

 Conidia ciliate at apex alone 



Conidia 1-ciliate 8. Monochastia, p. 558. 



Conidia several-ciliate 9. Pestalozzia, p. 558. 



Conidia l-cUiate at each end 10. Hyaloceras. 



Tozosporium Vuillemin (p. 557) 



Acervuli sublenticular, erumpent, scattered, minute, black; 

 conidia curved, beaked at each end, central cells dark, apical hya- 

 line; conidiophores short, simple. 



T. abietinum Vuill.^^^ causes drying out of Abies leaves in 

 Europe. 



Monochsetia Saccardo 



As in Pestalozzia except that the conidia bear only a single 

 seta. About sixty species. 



M. pachyspora Bubak. is common on Castanea, causing large, 

 circular, dead leaf spots with the acervuli showing in somewhat 

 concentric circles. 



Pestalozzia de Notaris 



Acervuli subcutaneous, erumpent, discoid or pulvinate, black; 

 conidia elongate, colored or the end cells hyaline, with several 

 hyaline setae on each end. 



A genus of over two hundred species of various habit, some of 

 considerable economic importance. 



P. hartigii Tub. causes disease of tree and shrub seedlings in 

 nurseries, constricting the stem just above the soil and resulting 

 in death. 



