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Iron concretions (Bfcc) in a Douglas fir soil on Vancouver Island

Blocky, angular structure in the B of Slide #140 at Dunlap Observatory, Richmond Hill.

Winter and snow cover at the Dunlap Observatory, Richmond Hill, the location of profile in slide #140

Same location as slide #207, but in March as snow is melting n.b. the litter layer of the forest floor.

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