The Anatomy And Some of the Biological Aspects of the "american Mistletoe," Phoradendron Flavesceus (Pursh) Nutt
The Anatomy And Some of the Biological Aspects of the "american Mistletoe," Phoradendron Flavesceus (Pursh) Nutt
York, Harlan H. (Harlan Harvey), 1875-1961
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Early in the development of the haustoria, a central conducting system is differentiated, while the surrounding cells remain thin- walled and form. the cortical region. The cells are rich in chloroplasts, especially in the outer portion Digitized by LnOOQ IC The American Mistletoe 17 of the cortex and well supplied with starch which becomes more abundant towards the interior. Grit cells are often present, but it is not always possible to determine their origin. They may be formed from cortical ...cells of the haustoria, or they may be groups of grit cells from the cortex of the host, which have, been sur- rounded and not dissolved by the digestive cells of the haustoria. SINKERS The cortical haustoria send out growths from their underside which penetrate the cortex to the cambium layer and later be- come imbedded in the wood by the formation of new annular rings. These outgrowths are known as the sinkers. Soon after they orig- inate from the haustorium they become directed to the medullary rays of the cortex of the host, which they traverse to the xylem.
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