. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. MYCODOMATIA OF THE ALDER, ETC. 101 provisionally distinguished as Frankia alni (Wor.) on alder, and Frankia Brunchorstii (Moll.) on Myrica Gale. Hiltner,^ after a series of experiments, states that first-year alders without tubercles do not thrive in soil free from nitrogen, nor do they take up nitrogen from the atmosphere; when, however, provided with root-tubercles th,ey assimilate nitrogen. The tubercles also fun
. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. MYCODOMATIA OF THE ALDER, ETC. 101 provisionally distinguished as Frankia alni (Wor.) on alder, and Frankia Brunchorstii (Moll.) on Myrica Gale. Hiltner,^ after a series of experiments, states that first-year alders without tubercles do not thrive in soil free from nitrogen, nor do they take up nitrogen from the atmosphere; when, however, provided with root-tubercles th,ey assimilate nitrogen. The tubercles also functionate in water, and soU rich in nitrogen has the affect of slightly increasing the assimilation of that element. The tubercle-fungus is at first parasitic on the alder, and is only of use to the plant after the tubercles have fully developed. Mycodomatia of the Leguminosae. All Leguminosae growing in their native soils exhibit the so-called tubercles. These are accessory formations of the primary root-rind and are furnished with vascular bundles, connected with the root- bundles ; they consist of a cortex of normal cells surrounding an inner large-celled parenchyma with turbid cell-contents con- sisting of numbers of bacteria, {Bacterium radicola, Beyerink, or Bhizobium leguminos- arum, Frank.) ^ Frank describes minutely the formation of these tubercles.^ The short rod-shaped microbe forces its way into a root-hair or epidermal cell, multiplies there, and is conducted to the inner cortical cells by plasma-threads continuous through the oell-walls. A rapid division of the inner cortical cells is set up, till a tubercle is formed, which may still further increase by continued cell-division from a meristem p^ot.) at its apex. The bacteria multiply simul- taneously, and are transferred into the new cells where a great change comes over most of them; they enlarge very ' Hiltner, "Ueber d. Bedeutung d. Wurzelknbllchen v. Alnus glutinosa," Ndbhe's Landwirtschaft. Versuchs
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