268 



Mycologia 



shoots continues, and the limited extent of the decayed areas in 

 six-year old sprouts harmonize readily with the idea that these 

 shoots were not attacked until the most rapid growth had ceased. 

 This makes the assumption that there was some causal connec- 

 tion between the rapid growth and the temporary immunity seem 

 not improbable. 



CoRiOLELLUS Sepium. — Although no other dangerous fungus 

 parasites of the hardy catalpa have been reported, the writer has 

 found several species growing to some extent both on living and 

 on dead catalpa (7, p. 116). Next to Polystictus versicolor, the 

 species which the writer has most frequently found fruiting on 

 catalpa stumps is Coriolelliis Sepium (Berk.) Murrill (Trametes 

 Sepium Berk.). While this fungus was not present in sufficient 

 abundance to be considered at all important from an economic 

 standpoint, it is interesting to note that the relation of the fun- 

 gus in the stump to the coppice shoot was apparently the same 

 as in the case of Polystictus versicolor. That is, the fungus al- 

 though well developed and in vigorous condition in the stump, 

 does not readily attack the shoot. Fig. 3 shows a section through 

 the base of a stump which bore numerous sporophores of Corio- 

 lellus Sepium and had given rise to a six-year old coppice shoot 

 of average size. It will be noted that the fungus had destroyed a 

 considerable portion of the stump but had not entered the sprout. 



Development of Tyloses near a Decayed Region 



In sections made for the purpose of studying the effect of the 

 fungus on the wood, an interesting relation between the presence 

 of the fungus and the occurrence of tyloses was noted. This 

 relation was observed in the wood of both seedling trees and 

 coppice shoots; and was so striking and constant that it seems 

 that there must be some causal connection and that the presence 

 of a decayed region in a trunk may have a direct bearing on 

 the development of tyloses. 



Tyloses were present to some extent in all pieces of catalpa 

 examined but a marked difference was evident between the num- 

 ber of tyloses present in sound and in infected wood. The 

 difference appears both in the number of tyloses present in each 



