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Puate I. Cross section of the trunk of a dying tree of the western yellow or . 
bullspimeshowmerblueicolor 222 ee 59s 2 ae eee Frontispiece. 
II. Dying trees of the bull pine. Fig. 1.—Green, ‘‘sorrel-top,’’? and 
~ ted-top”” trees. Hig. 2°— Greensand = sorrel-top74 tees) a= 5 4s-ae 40 
III. Color change in leaves of the bull pine. 1. Leaves from healthy 
tree. 2. Leaves from ‘‘sorrel-top’’ tree. 3 and 4. Leaves from 
trees turning to the “red-top’ stages 22 ae se eee ae eee 40 
IV. Fig. 1.—‘‘Red-top”’ tree in a group of healthy trees near Elmore, 
S.. Dak... Higt 2!2="' Blaeck-top 2 atkees) ve sane cee a ee ae 40 
V. Figs. 1 and 2.—Sections of trunks of the bull pine, showing early 
stages of: “blue disease 7. fc. seg ees ey eee yes eee 40 
VI. ‘‘Blue”’ sections from dead trees. Fig. 1.—Sections from tree dead 
five months. Fig. 2.—Sections from tree dead eighteen months - - 40 
VII. Mycelium and fruiting bodies of the ‘‘blue’’ and ‘‘red-rot’’ fungi. 
1. Tangential section of ‘‘blue’’ wood. 2. Crosssection of ‘‘blue’’ 
wood. 3. Crosssectionofamedullary ray. 4. Young perithecium 
of the ‘“‘blue”’ fungus. 5. Mature perithecia of the ‘‘blue’’ fungus. 
6. Two perithecia of the ‘‘blue’’ fungus. 7. Two asci with spores 
of the ‘‘blue’’ fungus. 8. Spores of the ‘‘blue”’’ fungus. 9. Top 
of beak of perithecium of Ceratostomella pilifera just after the dis- 
charge of the spore mass. 10 and 11. Median sections of sporo- 
phores,of the “‘rederot?/s fungus. 234 3 ee oper Ses oe ee eer ee 40 
VIII. Sections of ‘“‘blue’’ wood. Fig. 1.—Radial section. Fig. 2.—Tan- 
gential SECbIOM: ios Jeyee Se 8 Pace i Sr aie at ies yeh ea a ae 
IX. Pieces of wood from the bull pine, showing blue fungus starting 
from holes made by a wood-boring beetle. ...:..-2.2:.---2---..- 40) 
X. Sections showing early stages of the ‘‘red rot.’’ Fig. 1.—Section 
taken 35 feet from the ground from a dead tree. Fig. 2.—Section 
showing more advanced stage of decay. Fig. 3.—Section from tree 
shown in fies 2madel!> feetihi giver uy ss. see ee ee ee 40 
XI. Sections from ‘‘black-top’’ bull pines, showing advanced stages of 
decay. Figs. 1 and 2.—Sections from the top of a fallentree. Fig. 
3.—Section from a standing pine 4 feet from the ground..--...--- 40 
XI: Group of brokeml> blacktop 7 iene ese ese et ere eee 40 
XIII. Fig.1.—Top of ‘‘black top” broken off. Fig. 2.—Polyporus pon- 
derosus growine.ondead: pine stip se sane ae eee eee 40 
XIV. Sections of rejected cross-ties. Fig. 1.—Wood affected with ‘‘red 
rot.’? Fig. 2.—Diseased wood from living tree....-...---------- 40 
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