Browse Items (13652 total)

Three stages in crown decadence in 140+ yr white pine. Lake Temagami shoreline reserve.

Crown closure in mature stand, Algonquin park.

Black & white photograph of a crowd of people standing on a ship, name of ship illegible but it starts with an H.

Sports (Track and Field): Crowd at unknown track event. Donor: P. Voutilainen.

Sports: Crowd at unknown athletic event in Timmins. Donor: P. Voutilainen.

Cross-section of seedlings in situ showing lower dead foliage due to Botrytis and dead leadertop to aphids. Black spruce, 2+0, botrytis and aphid damage.

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

Cross-section of dense seedbed (300sdlgs/sq/ft) to show effects of Botrytis mold. Black spruce, 2+0, Botrytis damage.

Cross-section of black locust nodule (x4) to show general structure and the red colour due to presence of 'leghemoglobin' which shows there is active nitrogen-fixation. Alfisol, HF, BSY.

Cross-section of black locust nodule (x360) to show rhizobium cells the bacteria which due the nitrogen-fixation. Alfisol, HF, BSY.