. cellulose and a granulose part, Hartig describes the process thus (Fig, 11). The mycelium of species like Polyijorits igniarius gives oft' some ferment which dissolves the starch-grains, by cor- roding them from the outside inwards, so as to form holes and canals similar to those in starch-grains in process of dissolution in the cells of a sprouting potato. In others, Thdqihora pcrdie, the granulose is first dissolved from without inwards, so that finally only the starch-cellulose remains, occupying a region ^^^ grains from the oak, m pro- tnwavrla thi:^ nntor i-iQvt-o r>f
. cellulose and a granulose part, Hartig describes the process thus (Fig, 11). The mycelium of species like Polyijorits igniarius gives oft' some ferment which dissolves the starch-grains, by cor- roding them from the outside inwards, so as to form holes and canals similar to those in starch-grains in process of dissolution in the cells of a sprouting potato. In others, Thdqihora pcrdie, the granulose is first dissolved from without inwards, so that finally only the starch-cellulose remains, occupying a region ^^^ grains from the oak, m pro- tnwavrla thi:^ nntor i-iQvt-o r>f cess of dissolution by ferments, o, of T/it/ tOWaraS Cnc outer parts Ol i,-;,,. â l,, oi Polr/porus sulplmreus ; c, of Poly- thp (fVQin no n l-inrl < ImoV j'orM i(/niarius. In a and b the iodine-reaction Llie gldUl as a kina OI nUSK, Is shown by shading. (After R. Hartig.) which is in time gradually used up. In Polyporus sidphurcus the operation is reversed ; the starch-cellulose appears to be dissolved out first, leaving a residue of granulose. These observations were based on the assumption that the starch-grain consisted of a granu- lose portion wliich turned blue with iodine, and a starch- cellulose portion which became yellow; or again, on treating the starch-grains with dilute acids the granulose was dissolved, while the cellulose remained in the form of a skeleton. Although more recent investigations have shown that the cellulose-skeleton results from the action of the acids, and that this view of the constitution of the starch-grain was not quite correct, yet Hartig's observations prove that tlie various fungus- ferments have each their own action on starch-grains; his results are also supported by other facts. Other fungi besides Polyporeae utilize the starch of their host-plants, thus Phytophtliora in leaves of the potato. The formation of calcium oxalate is influenced by action of parasites. From Wakker's synopsis of the phenomena of hyper- trophy,
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
