The diseases and pests of the rubber tree . kwards over the lower surface. When the fimgus is allowed to luxuriate unchecked, thesebrackets grow one above the other for a distance of two orthree feet, united behind by a continuous orange - yellowcushion. At the same time fresh plates are produced at thesides of the old ones, and these fuse with the latter and makethe edge of the brackets more irregular. Such masses ofbrackets may extend along fallen logs, or along the lateralroots of jungle stumps for several yards (Plate I.). When growing on the under surface of a log, and some-times also in
The diseases and pests of the rubber tree . kwards over the lower surface. When the fimgus is allowed to luxuriate unchecked, thesebrackets grow one above the other for a distance of two orthree feet, united behind by a continuous orange - yellowcushion. At the same time fresh plates are produced at thesides of the old ones, and these fuse with the latter and makethe edge of the brackets more irregular. Such masses ofbrackets may extend along fallen logs, or along the lateralroots of jungle stumps for several yards (Plate I.). When growing on the under surface of a log, and some-times also in other situations, the fructification of Fomeslignosus may take the form of an orange or red-brownplate, spreading flat over the surface and closely adherentto it, instead of the usual bracket shape. This is knownas a resupinate or Poria form (Fig. 2). There is a very common fungus which is frequentlymistaken ior Fomes lignosm, and, indeed, in the,dry state CHAP. 32 THE RUBBER TREE it is scarcely distinguishable from it. When dry it is pale. Fio. 2.—Fames lignosua ; young mycelium and resupinatefructifications, xf. yellow-brown, with narrow red-brown concentric zones. It ROOT DISEASES 33 is usually smaller than Forms Ugnosus, and, deeply grooved,both radially and, concentrically. Like Fomes lignosus itcurls up as it dries. When fresh, however, it is fairly easilydistinguished. It is never so red-brown, and it does nothave an orange margin. The lower surface is usually adingy, livid grey, though it sometimes becomes best way of identifying it is to break it in two ; it isthen seen to be uniformly white internally, both in thefibrous layer and the tubes, whereas Fomes lignosus, as alreadystated, shows two colours in section. This species is Poly-porus zonalis, It is common on dead wood, especiallyon palms and bamboos, but is merely saprophytic. It hasthe same power as Fomes lignosus of spreading through thesoil and producing its fructification on anything it
Size: 1131px × 2210px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookidcu3192400285, bookyear1921
