98 



THE FUNGI WHICH CAUSE PLANT DISEASE 



14 15 



Fio. 67. — ^P. Bchlcideni. 11. Mycelial threads between the large conductive cells of 

 the leaf; (a) the mycelial thread; (b, b) branched or coiled haustoria; (c) branched 

 haustorium wrapped about the nucleus. 13. Young conidiophorcs, (a, a) turn- 

 ing toward the stoma, (b); (c) haustorium wrapped about the nucleus of the 

 epidermal cell. 14. Mature conidiophore (a) with mature conidia, (c, c); 

 (d) germ tube of conidium entering stoma. 15. Oospores, (a) mature oospore 

 with old antheridium, (d) still attached; (b) mature odspore still inclosed in the 

 old wall of the oogonium. After Whetzel. 



