178 Ustulina Zoiiata {Lev.) Sacc. on Hevea Brasiliensis 



PLATE V. 



Fig. 9. Showing typical flat, zoned fnictification. {h nat. size.) 



Fig. 10. Common variation — consisting of stalked individuals aggregated to form a 



compact mass. At the edges a lichenoid form can be seen, while old plate fructifications 



are present below but cannot be brought up in the photograph. (^ nat. size.) 

 Fig. 1 1 . Isolated individual stalked (Xylaria) form — darker area at top indicates the spore 



bearing part. (Nat. size.) 

 Fig. 12. Microphotograph of longitudinal section of Fig. 11, The layer above the black 



line at the top is the spore bearing (conidial) layer. 



PLATE VI. 



Fig. 13. Another specimen of aggregated stalked form passing into lichenoid type at 



edges, (i nat. size.) 

 Fig. 14. Lichenoid form of U. zonata in young condition. (Nat. size.) 

 Fig. 15 a. Upper zoned surface of culture started from conidia. 

 Fig. 15 b. Under surface of 15 a — zoning extends througli substance of culture. 

 Fig. 16a. Upper surface showing false zoning of culture started from same source as 



15a and 15b. 

 Fig. 16 b. Under non-zoned surface of 16 a. 



Fig. 17a. Typical zoned culture from collar-rot tree (under surface). 

 Fig. 17 b. Showing typical under-surface of non-zoned culture started from same source 



as 15 a and 16 a. 



PLATE VII. 



Fig. 18. Petri dish zoned culture showing attempt to produce lichenoid form. 



Fig. 19. Photograph of section of tree artificially inoculated at the collar. Indicates 



progress made by fungus in seven months. (J nat. size.) 

 Fig. 20. T.S. of wood of H. Brasiliensis attacked by U. zonata. Black lines commencing 



to form in meduUary rays {m). 



PLATE VIII. 



Fig. 21. L.S. of scraped tree, see Figs. 5 and 6, indicates progress of fungus in stem in 



seven months time. (J nat. size.) 

 Fig. 22. Sections of lateral roots showing U. zonata travelling in the middle. External 



tissues apparently health ^^ (:} nat. size.) 

 Fig. 23. Blocks of rubber wood on which cultures of U. zonula have been grown. Split 



open to show black lines in middle. (Nat. size.) 



