. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 26 BULLETIlSr 360, U. S. DEPARTMENT OF AGEICULTUEE. unusual habitat), Trametes serialis Fr., and Lenzites sepiaria Fr. Foines finicola Fr. was found rotting the heart wood of living trees in three different cases and had entered its host through mistletoe burls 10 feet from the ground. PolypoTiis volvatus Pk. occurs fre- quently on the burls of larch and yellow pine. Several species of ThelephoraceEe were collected from the mistletoe burls, chief of which _ were Stereuni sulcatum Burt, Corticium herkeleyi Cooke, C. gal
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 26 BULLETIlSr 360, U. S. DEPARTMENT OF AGEICULTUEE. unusual habitat), Trametes serialis Fr., and Lenzites sepiaria Fr. Foines finicola Fr. was found rotting the heart wood of living trees in three different cases and had entered its host through mistletoe burls 10 feet from the ground. PolypoTiis volvatus Pk. occurs fre- quently on the burls of larch and yellow pine. Several species of ThelephoraceEe were collected from the mistletoe burls, chief of which _ were Stereuni sulcatum Burt, Corticium herkeleyi Cooke, C. galactinwrn (Fr.) Burt, and Peniophora suhsul- phured (Karst) Burt. Cera- tostomella pilifera (Fr.) Wint., the bluing fungus, appeared occasionally in the dead wood of the burls. Trametes pini affected 80 per cent of all burls attacked by fungi. Since the most advanced stages of decay were always at the burl or in its near vicinity, it was as- sumed that the fungi had en- tered at this point. The de- caj^ at or in the burl tissues was in most cases not con- nected with the decay which is often present in other parts of the trunk. The breakage of old branches possessing heartwood, through the accumulation of brooms at their outer ex- tremities, is likewise a means of fungi entering the tree. Not infrequently^ F o Tries laricis enters its host by this means. Mistletoe burls on Douglas fir are known to become infected with Trametes jnni. A mistletoe burl on Alpine fir was found to be inhabited in one instance by Pholiota adiposa Fr. Meinecke (10, p. 58) refers to the mistletoe cankers of Abies concoJor as offering an easy entrance to germinating spores of EcMnoclontium tinctorium. Burls on yellow pine, owing to their resinous condition, are seldom attacked by wood-destroying fungi. The bluing fungiis, however, has been found by the writer in the distorted tissues of mistletoe burls on living yellow Fig. 25.—The soft spongy cortex of a mistletoe infection on lodgepole pine gn
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