. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. EFFECT OF PARASITIC FUNGI ON CELL-CONTENTS. 35. cellulose and a granulose part, Hartig describes the process thus {Fig. 11). The mycelium of species like Polyporus 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, e.
. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. EFFECT OF PARASITIC FUNGI ON CELL-CONTENTS. 35. cellulose and a granulose part, Hartig describes the process thus {Fig. 11). The mycelium of species like Polyporus 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, Thelephora perdix, the granulose is first dissolved from without inwards, so that finally only the starch-cellulose remains, occupying a region no. grams from the oak, m pro- towardt! thp mitpr i-iarfa nf cess of dissolution by ferments, a, of r/i€fcj7/iora UUWdlUb tne OUrer pares OI perdU; b, ot Polj/pm-us sutphureus ; c, ol Pol)- t"hp arnin n« a Iritirl <-if Vinot porus isniarius. in a and ii the iodine-reaction Liie gram as a Kina oi nusK, r^ ^^^^^ ^,y s^^jng. (After r. Hartig.) which is in time gradually used up. In Polyporus sulphuretis 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 which 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 the various fungus- ferrnents have each their own action on starch-grains; his results are also supported by other facts. Other fungi besides Polypo
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