Diseases of plants induced by Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith diseasesofplants00tubeuoft Year: 1897 458 BASIDIOMYCETES. point, whereby a felted tissue, called the medulla, is produced in the interior. The outer parts of the pseudoparenchyraa, on the other hand, coalesce to form the so-called rind, which when young gives off numerous delicate hyphae, and these, taking advantage of the medullary rays, penetrate the wood, and especially the resin-ducts, should su
Diseases of plants induced by Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith diseasesofplants00tubeuoft Year: 1897 458 BASIDIOMYCETES. point, whereby a felted tissue, called the medulla, is produced in the interior. The outer parts of the pseudoparenchyraa, on the other hand, coalesce to form the so-called rind, which when young gives off numerous delicate hyphae, and these, taking advantage of the medullary rays, penetrate the wood, and especially the resin-ducts, should such be present. In the wood the growth is upwards. This filamentous mycelium, which pro- gresses much more rapidly in the interior of the wood than the rhizomorphs whicli grow in the cortex, completely destroys Fig. 288.—Apai'icus hielUus. Rhizomorphs in the form of dai'k atiastomosing bands, developed between the bark and wood of a tree. (v. Tubeuf phot.) the parenchyma that exists in the neighbourhood of the resin- ducts, and to all appearance this is accompanied by a partial conversion of the cell-contents and the cell-walls into turpentine. The turpentine sinks down under its own weight, and in the collar, where the cortex is withered, having been killed by rhizomorphs, it streams outward, pouring partly in between the wood and the cortex, and partly into the surrounding soil at places where the cortex has ruptured owing to drying. On this account the disease was formerly called ' IJesin-flux' or
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