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 I'EniDEKMllM. -tia branch, the living portions of the ring grow du \sitli vigour, and even attempt to close o\er the injured portion. This irregular growth, continued in many cases tor years, i»ro- duces abnormal cross-sections (Fig. 248). The mycelium grows out centrifugally from diseased spots, so that the wnunds continue to enlarge, and the disease
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 I'EniDEKMllM. -tia branch, the living portions of the ring grow du \sitli vigour, and even attempt to close o\er the injured portion. This irregular growth, continued in many cases tor years, i»ro- duces abnormal cross-sections (Fig. 248). The mycelium grows out centrifugally from diseased spots, so that the wnunds continue to enlarge, and the disease becomes easily noticeable on account of the deep channels and distcjrted swellings on the pine branches and stems. As the disease spreads inwards into the stems, the conduction of water is interfered with and the Ijranches above such wounds dry up and die ofl'. Whereas iiiiiiiaii Fi<i. -iVi. — Pi.,-idi:vnumi\. pini (corlicola). <i, n. Mycelial stroma developed in tlic rind; the host-cells have become isolated from each other and contain haustoria, A, of the fungus. /, The iKjridium. (After R. Hartig.) young plants soon succumb to attack, the struggle with old trees may go on for years. Fresh infection of older stems occurs generally in the hiudier ])arts of the tree, where tiie b;irk is still thill. Tycnidia (six-rmogonia) are developed between the riiid- parenchyma (periderm) and cork, generally towanls the margin of diseased spots. The coiiidia emerge from llie iii|itiired cork-layers of the bark as a honey-sweet liipiid. II. >rayi states that this liniiid is gi\-en off in such tpiaiitity from species of ]') ridi'rniiIIIII in .lapaii, that it is collected and eaten bs' the natives.
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