Heald-Wolf: Whitening of the Mountain Cedar 209 



from 600-1000 X and at maturity they are faintly bluish, less 

 mature specimens being hyaline (pi. ji, f. 6). They are multi- 

 septate, generally curved or twisted, and each locule is twice as 

 long as wide. The paraphyses, which are abundantly present, 

 are unbranched, non-septate, and about one-third the width of the 

 spores (pi. ^i, f. 7). 



Geographical Distribution 

 The mountain cedar is commonly present on the limestone 

 slopes and hills throughout central, southwestern, and western 

 Texas, and extends south into Mexico. In all probability the 

 range of the fungus is co-extensive with the distribution of the 

 mountain cedar. The disease has been observed to be present 

 wherever the cedar occurs in the territory within a radius of 

 one hundred miles of San Antonio. 



Effect on the Host 

 That the fungus is parasitic is very probable. It occurs most 

 abundantly on the younger twigs and young trees, especially 

 where there is more or less shading, such as occurs when the 

 trees grow in dense brakes. The lowermost branches in such 

 brakes are generally dry and covered with the whitish areas. 

 The shading has only served to render the branches more sus- 

 ceptible to the attacks. The affected branches are not killed until 

 the fungus surrounds them completely, corrodes the bark, and 

 destroys the cambium layer. The corrosion of the dead branches 

 may then continue and leave the protruding perithecial nodules 

 as previously mentioned. Very frequently, entire trees of vari- 

 ous ages or many of the branches are dead and whitened, appar- 

 ently as a result of the inroads of the fungus. 



' Technical Description - ' 



Cyanospora gen. nov. 

 Peritheciis solitariis vel saepe duobus, raro tribus, pustulis cor- 

 tici vel ligno immersis, horizontalibus, elongatis in eadem via 

 quam axe stromatis, ostiolis lateralibus, leviter pertusis. Ascis 

 gracilibus, linearibus, in matrici glutinosa, membranis internis 

 apicis incrassatis, basi ruptis. Sporidiis filiformibus, pleurisep- 

 tatis, hyalinis. 



