FOREST PROTECTION 121 



and sugar pines; the speckled rot or red heart 

 of Douglas fir; the cork of western hemlock. 

 It is found only in trees over forty years old, 

 usually more in the top of the tree, — but in 

 Pinus monticola close to the gound. The wood 

 never rots out entirely and the absence of cavi- 

 ties is characteristic of this fungus. It enters 

 through branch stubs containing heartwood. 

 Reference Bull. For. 33, p. 15; F. & L 1902, 

 p. 62; Agric. Year Book 1900, plate XXII. and 

 XXIV. and page 206. 



III. Polyporus juniperinus creates long holes coated white 



in the heartwood of red cedar. (For. Bull. 31, 

 p. 25; Agric. Year Book 1900, p. 208; Bull. 21 

 of Div. of Vegetable Pathology). 



IV. Polyporus carneus causes the red rot of red cedar 



and of arbor vitse. The wood splits into small 

 cubes, charcoal like. (Bull. 21 of Div. of Vege- 

 table Physiology and Pathology; For. Bull. 21, 

 p. 26). 

 V. Polyporus versicolor causes the soft rot of live catalpa, 

 Polyporus catalpa the brown rot of the species; 

 Bull. Bureau Plant Industry, No. 149, page 47 

 and pp. 53 to 56; Bull. 37 of Bureau of Forestry, 

 pp. 51-58; also in oak and hemlock and beech 

 (For. Bull. 51, p. 31) as a saprophyte on ties. 



VI. Polyporus rimosus causes the yellow rot of black 

 locust, in its heartwood. Holes made by locust 

 borers (Cyllene robirdce) serve as entrances. 

 (Agric. Year Book 1900, p. 207); Contr. Shaw 

 School of Botany, No. 17; Bureau Plant Indus- 

 try Bull. No. 149, p. 45. 



VII. Polyporus schweinitzii causes the "butt rot," "ground 

 rot" or "root rot" of all conifers, notably of 

 Douglas fir and hemlock. Fungus enters at the 

 base of the tree through insect mines. Trees 

 die in patches; sporophores are short-lived. 

 (Bull. For. 33, p. 15; F. & I. 1902, p. 61; Agric. 

 Year Book 1900, p.p 203 and 206, and plate 



VVTTA 



JLAlVj. 



VIII. Polyporus fraxmophilus occurs in white ash having 

 over seven inches d.b.h. The hyphse seem to 

 enter by the water niches left by broken branches. 

 Wood becomes straw colored. Very frequent. 

 Reference Bull. 32 and Bull. 149, page 46, of 

 Bureau of Plant Industry. 



