A heart rot apparently identical with that caused "by 

 Schweinitzii is found in the following species of trees, upon which 

 the sporphores of the fungus have never "been found: Juniperus 

 monosperma, J. pachyphloca, J. scopulorum, J". utahensis, Taxus 



) 



brevifolia, and Thuja plicata. 



Formes laricis (Jacq.) 1'urr. is the cause of a yellow to red- 

 "brown heart rot of living and dead trees of a number of species 

 of conifers in the West. In the ITorthwest it causes a common heart 

 rot of larches; and in the Southwest^ of some species of pines. 

 It is known to attack the following species of trees: Abies concolor, 

 Larix occidentals, Picca engelmanni, P. sitchensia, Pinus lanbertiana, 

 P. murrayana, P. ponderosa, Pseudotsuga taxifolia, and Tsuga heteror 



phylla. 



In northern Arizona, Pinus ponderosa is diseased more often 



with this than any other fungus. 



Echinodontium tinctoriuin E, & B. is the cause of a very 

 interesting heart rot of living trees of a number of species of con- 

 ifers. In the earlier stages of the rot, the wood is sli-htly dis- 

 colored, and becomes very wet. The fungus discolors a portion of the 

 wood, attacking first the spring wood of each annual ring, causing 

 the wood to separate into flakes. Finally the wood is for the great- 

 er part dissolved and left in brown strings, leaving the tree hollow. 



The following species of trees are attacked by Echinodonti^ 

 tinctorium: Abies amabalis, A. arizonica, A. concolor, A. grandis, 

 A. lasiocarpa, A. magnifica, A. nobilis, Picea engelmanni, Pseudot- 

 suga taxifolia, and Tsuga heterophylla. This fungus is very 



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