A Disease of Taxodium Known As Peckiness Also a Similar Disease of Libocedrus D
A Disease of Taxodium Known As Peckiness Also a Similar Disease of Libocedrus D
Hermann Von Schrenck
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They enlarge within the secondary lamella, a feature which is common to wood destroyed by many wood-destroying fungi. The scarcity of mycelium is striking, resembling in this respect wood in which Poly- porus sulphureus has been growing. * In branches where the disease is in its youngest stage, the mycelium occurs more plentifully in those areas, which correspond to the holes to be formed later on. Between these areas the hyphae pass, boring through the tangential walls. Besides the colorless m...ycelium, a mycelium is often present in the wood between the decayed holes. This appears to belong to some saprophyte, which has nothing to do with the original decomposition. This mycelium is composed of brown threads which pass through the tan- gential walls preferably and follow the direction of the tracheids up and down. These hyphae form marked at- tachment organs when boring through the cell-walls. Frankf described such organs as formed by the germ tubes of Fusi- cladium tremulae. The hypha when it touches the epidermis forms a swelling with one or more pores, from which fine tubes push through the walls into the epidermal cells.
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