. Annals of applied biology. Biology, Economic; Biochemistry. A. Sharplbs 161 him in Malaya, though it appears a constant feature. It is very transitory as observed in the Laboratory; 4-5 days is the actual time between its appearance and the dispersal of the spores, (b) is the upper black zone, composed of compact tissue very similar to that composing the black lines, as seen in a diseased collar, (c) is a white loosely compacted zone in which the globular perithecia are formed, (d) is a broader band, grey in colour and leathery in consistency, (e) is the black zone on the under surface, whic
. Annals of applied biology. Biology, Economic; Biochemistry. A. Sharplbs 161 him in Malaya, though it appears a constant feature. It is very transitory as observed in the Laboratory; 4-5 days is the actual time between its appearance and the dispersal of the spores, (b) is the upper black zone, composed of compact tissue very similar to that composing the black lines, as seen in a diseased collar, (c) is a white loosely compacted zone in which the globular perithecia are formed, (d) is a broader band, grey in colour and leathery in consistency, (e) is the black zone on the under surface, which is continuous at the margins with the black zone towards the upper The globose perithecia communicate with the exterior by very narrow channels. The first formed elements of the perithecia can be recognised in suitably stained sections very early in the development of the fructifi- cation, long before the production of conidia. These elements stain more deeply with protoplasmic stains than surrounding ones and appear as small circular patches of spirally running hyphae. In the early stages of development, the black zone is not present in the fructification. Whilst the stroma is still soft and yellowish, the walls of patches of cells of the loosely compacted layer, irregularly distributed, but at the same depth, become impregnated with carbonaceous material. Later, the walls of the cells of the loosely compacted layer intervening between the black patches become impregnated with similar material, their cell contents darken, and a continuous black, brittle zone is formed. It is a very characteristic zone, and can be used as a rough diagnostic feature when studying the variable forms of fructifications produced by this fungus. This zone is always present in the " Xylaria " forms of the fungus; many true Xylarias are found on rubber trees killed by JJ. zonata, but these do not show the black carbonaceous zone to which the fructifi- cation of TJ. zonata owes it
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiochem, bookyear1918
