Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] GYMNOSPORANGIUM 315 chains. Closely allied to Phragmidhtm, differing mainly in the relatively greater number of cells forming the teleuto- spore. Both stages grow on the same host-plant. Burnet leaf spot {Xenodochus carbonarius, Schlecht.) is parasitic on this plant. The aecidium stage forms large, orange-red, roundish patches on the leaves, and elongated patches on the stems. This is followed by the black, wart- like pustules of the teleutospore stage on the leaves. Only met wi
Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] GYMNOSPORANGIUM 315 chains. Closely allied to Phragmidhtm, differing mainly in the relatively greater number of cells forming the teleuto- spore. Both stages grow on the same host-plant. Burnet leaf spot {Xenodochus carbonarius, Schlecht.) is parasitic on this plant. The aecidium stage forms large, orange-red, roundish patches on the leaves, and elongated patches on the stems. This is followed by the black, wart- like pustules of the teleutospore stage on the leaves. Only met with in this country on Sajiguisorba officinalis. Aecidiospores subglobose, yellow, warted, produced in short chains, then becoming free, 15-25 X 14-20 /-i. Fig. 94.—Xenodochtiscarbonarius. i, teleutospore pustules on Burnet saxifrage, nat. size; 2, a single teleutospore, highly mag, ; 3, a chain of uredospores, highly mag. Teleutospores cylindrical or worm-like, often curved, composed of 10-20 globose cells, much constricted at the septa, smooth or minutely warted towards the apex, dark brown; individual cells 15-20 /x diam.; stalk short, hyaline. GYMNOSPORANGIUM (Hedw.) Teleutospores forming large subgelatinous masses, oozing out from the bark of the matrix (always Junipers in this
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