View of same location as slides # 207 and 208 showing litter after snow has gone, n.b. the curling of the leaves and the exposure of of the surface of the Ah.

Nodules of Comptonia peregrina N-fixing

Mycelium of Phytophthora cinnamomi in W. Australia

Comptonia peregrina plant in Plonski Forest; this is the plant which had the nodules shown in slide #210.

Nodules on roots of Alnus glutinosa from Dorset area; x10.

Nodules from roots of Alnus glutinosa in Dorset area; n.b. scale

Cross-section of nodule on Alnus glandulosa showing infected cortical cells (actinomycetes?) stained red; central red tissue are the vascular elements.

Microsection of Alnus nodule to show the infected cortical cells; n.b. the mycelia of the actinomycete which terminate in the vesicles. cf. slides # 213-217

Microsection of the cortical cells of an Alnus nodule to show the vesicles (stained red) within the cell which are thought to be the site of Nitrogen fixation

Algal growth on soil surface which is fixing Nitrogen