Hedgcock-Long : Notes on Three Rots of Juniper 111 



ness 2-4 cm., narrowly attached ; surface tomentose, sulcate, red- 

 dish-brown to dark brown; margin obtuse, velvety, melleous to 

 ferruginous, plane below; context woody, reddish-brown, 0.5 to 

 2 cm. thick; tubes indistinctly stratified, 0.5 to i cm. long each 

 season, melleous within, reddish-brown in older layers, mouths 

 circular, 2-3 to a millimeter, edges obtuse, entire, melleous to 

 fulvous; spores very abundant, fulvous, smooth, spheroid to 

 broadly ellipsoid, somewhat angular, 5-6 X 6-7 /x, cystidia few, 

 nearly colorless, 100 X 20 ^u,, pointed (in specimen at hand), some- 

 what encrusted. This description is drawn from a specimen 

 collected at Sparrow Point, Md., by Dr. Perley Spaulding in 1908. 

 Type locality: Tennessee. 



Habitat: Trunks of living trees of Juniperus virginiana L. 



Distribution : Tennessee, Kentucky, and Maryland, probably 

 more or less prevalent throughout range of host. Only 3 or 4 

 sporophores of this fungus have ever been reported, but the rot is 

 known to occur in the states mentioned. The sporophores form 

 from a dense whitish weft of mycelium, which has grown out 

 through the wood of a dead branch or from a knot hole. 



Yellow Rot of Juniper 

 FoMES earlei (Murrill) Sacc. & D. Sacc. Sacc. 

 Syll. 17: 119. 1902 

 Pyropolyporus Earlei Murrill, Bull. Torrey Club 30: 116. 1903. 



Rot light brown, slightly paler than the unchanged heart wood, 

 forming longitudinal holes from one to several inches in diameter 

 and two to several inches in length ; holes, as a rule, partially 

 filled with undecomposed wood particles which are often matted 

 together by the light yellow mycelium of the fungus ; rotted areas 

 usually abruptly limited by annual rings, thus making longitudinal 

 tube-like holes several times longer than broad ; both heart and 

 sap wood may be attacked, but usually only the heart wood. 



The enzym from this fungus attacks the medullary rays and 

 the walls of the bordered pits, gradually enlarging the pits until 

 only clear round holes are left. These holes gradually coalesce, 

 and the tracheids are thus divided longitudinally, leaving jagged 

 strips of tissue, the uncorroded corner remnants of the walls 

 where three or more tracheids joined. The enzym does not 

 delignify the walls of the tracheids but corrodes the tissues as a 

 whole; neither are the middle lamellae destroyed as in the white 

 rot of juniper. 



Pileus woody, broadly ungulate to semi-cylindrical in old sporo- 



