Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] 244 DISEASES OF CULTIVATED PLANTS Pleospora gummipara, Oud. i—Coryneum guminipariuin, Oud.), is considered by Oudemans to cause the production of Arabian and Senegal gum, on species of Acacia. The cause of gumming on some species of Acacia has, however, been proved to be due to a bacterium, and is described on another page. Oudemans, Hedzvigia, 1883, pp. 131 and 161. CUCURBITARIA (Gray) Perithecia clustered on a stroma, globose, black; asci Fig. 70.—Cuciirbilariii lahiiini. i
Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] 244 DISEASES OF CULTIVATED PLANTS Pleospora gummipara, Oud. i—Coryneum guminipariuin, Oud.), is considered by Oudemans to cause the production of Arabian and Senegal gum, on species of Acacia. The cause of gumming on some species of Acacia has, however, been proved to be due to a bacterium, and is described on another page. Oudemans, Hedzvigia, 1883, pp. 131 and 161. CUCURBITARIA (Gray) Perithecia clustered on a stroma, globose, black; asci Fig. 70.—Cuciirbilariii lahiiini. i, branches showing the fungus ; 2, stroma in section, with perithecia; 3, ascus containing spores; 4, free spores. Fig. i nat. size ; remainder highly mag. cylindrical, 8-sporcd, spores elongated, muriform, coloured ; paraphyses numerous. Silver fir Cavara has described in detail ;i disease of Ahies pcctinata caused by Cucurhitaria pithyophila (De Not., var. ceml>rae, Rehm.). Trees are attacked up to the age of sixty years, but younger trees are most susceptible.
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