254 



MANUAL OP POISONOUS PLANTS 





Fig. 81. Tuberaceae. Truffles. 1. Tuber ruhrum. Part of interior of a truffle, show- 

 ing hyphae, asci, and ascospores, greatly magnified.^ 2. T. aestivum, fruiting body. 3. T. 

 brumale, section of truffle. 4. Ascospore of T. Magnatum. 1, 3, 5, after Tulasne. 2 

 after Wettstein. 



ing to the lower surface. The spot contains a small pustule called the apothe- 

 cium, which is cup-shaped. This cup-shaped body contains the asci (sacs) in 

 which 8 small spores occur, the ascospores with the ascus, the two slender 

 threads are known as paraphyses. This fungus is a serious parasitic disease 

 of the alfalfa. The fungus does much injury to the fodder and it is not im- 

 probable that at times may be injurious to animals consuming the fodder. 



Fig. 82. Enlarged leaf showing spots, b. Single spot enlarged: c. Ascus with 

 ascospores, paraphyses coming from mycelium. 



