. Les maladies des plantes induite par les parasites cryptogamiques : introduction à l'étude des champignons pathogènes, slime-Champignons, bactéries, algues &amp ; . Les maladies des plantes ; plantes parasites, champignons. 38 RÉACTION DE L'HÔTE D'ATTAQUE PARASITAIRE. Les hommes d'autres substances font leur apparition dans les parois lignifiées, phlobaphenes tinctoriale principalement. Les murs de la bois-éléments ne sont toutefois pas lignifiée dans la même mesure. La couche primaire du mur est, en règle générale, plus lignifiés et contient, mais peu de cellulose. En con- séquence, par traitement avec des solvants de la lignine, il devient le premier tandis que l'enseignement secondaire et dissous

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. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 38 REACTION OF HOST TO PARASITIC ATTACK. men other substances make their appearance in the lignified walls, chiefly tinctorial phlobaphenes. The walls of the wood-elements are, however, not lignified to the same extent. The primary layer of the wall is, as a rule, lignified most and contains but little cellulose. In con- sequence, on treatment with lignin-solvents, it becomes first dissolved while the secondary and tertiary membranes, although their lignin is also partially dissolved out, remain behind as a distinct framework of cellulose. With longer treatment destruc- tion of the tissue proceeds till only the pure cellulose membranes of the isolated cells remain. The ferments of many fungi act in this way; for example Trametes pini, as shown in Fig. 12; at a the wall is in its normal condition, showing a primary. Fig. 12.—Section of tracbeides of pine-wood in process of dissolution by the ferment of Trameta pini. ij^. (After R. Hartig.) wall and two striated secondary membranes; at b the fungus- ferment has caused a splitting of the primary wall, which formerly appeared as a single layer, and the elements are separating from each other; the " filling-material" of the inter- cellular spaces (under c), and the ring of lime surrounding the cavity of the pit d, remain for a longer time; the right wall of the cell b consists only of cellulose, (as indicated by the striation being no longer shown, although still present); in the cell e the primary wall has disappeared, and the secondary and tertiary membranes thin off towards / in which only the ash constituents remain as fine granules, better seen in Fig. 13. In contrast to the ligniu-dissolving fungi, there are those which dissolve cellulose. When wood is treated with sulphuric. Please note that these images are extracted from s

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