Canadian Forest Service Publications
Dwarf mistletoe seed capsule orientation and seed discharge in western hemlock. 1979. Thomson, A.J. Canadian Journal of Botany 57(17): 1841-1844.
Available from: Pacific Forestry Centre
Catalog ID: 1836
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The seed discharge of Arceuthobium tsugense is closely related to the orientation of the seed capsule. The distribution of capsule orientations may therefore be used as a guide to the discharge pattern. With plants on the periphery of the crown, the azimuth orientation of the capsules directs seeds outward from the crown, whereas plants within the crown have an inward direction of azimuth capsule orientations. The distribution of vertical orientation angles is related to the growth angle of the branch bearing the infection. Infections near the crown periphery would appear to be more related to spread of infections, whereas those within the crown are related to intensification.