. Fig. 321.—Aiiobaena cyciuUarum. A, Coral-like surface-roots of B, Trans- verse and longitudinal sections of A ; the double line indicates the distribution of the Nogtoc. (v. Tubeuf del.) completely siiut in. In this condition it is absolutely de- pendent on nourishment derived from the host-cells, and seems to thrive on it. Xo outward symptoms of disease can be observed on Gunnera with enclosed Nostoc, the local destruction of the cell-contents, the loss of starch, and the filling up of the tissues with filaments of Nostoc having apparently no effect. The species of Gunnera have a v
. Fig. 321.—Aiiobaena cyciuUarum. A, Coral-like surface-roots of B, Trans- verse and longitudinal sections of A ; the double line indicates the distribution of the Nogtoc. (v. Tubeuf del.) completely siiut in. In this condition it is absolutely de- pendent on nourishment derived from the host-cells, and seems to thrive on it. Xo outward symptoms of disease can be observed on Gunnera with enclosed Nostoc, the local destruction of the cell-contents, the loss of starch, and the filling up of the tissues with filaments of Nostoc having apparently no effect. The species of Gunnera have a very short stem with a growing point hardly raised above the level of the soil, so that the Nostoc easily finds its way there. Xo algae have Ijeen found in the petiole and lamina of the gigantic leaves. Gunnera may easily be cultivated although it contains no Nostoc. Jonsson^ regards Nostoc gunncrac as identical with N. puncti- ijonsson, Botan. Notistr, 1894.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
