The endophytic system of Arceuthobium minutissimum, the Indian dwarf mistletoe
1970
Bhandari, N.N. | Nanda, K.
The Indian dwarf mistletoe, Arceuthobium minutissimum Hook f. is the most diminutive dicotyledonous stem parasite on Pinus excelsa. The endophytic system is well developed, having a large number of anastomosing strands in the cortex and sinkers penetrating the medullary rays in wood. The cortical strand is protostelic with the central tracheary elements, the vessels, surrounded by paren-chymatous cells. An earlier report of absence of vessels seems to be erroneous. The growth of the cortical strands is effected by an apical cell. The sinkers typically associated with the rays of host, are composed of parenchymatous cells and tracheary elements including vessels. They make contacts with the cells of the ray through pits present in the tracheary elements. The sinkers cause hypertrophy and even fusion of two or more rays to form a composite medullary ray. The tracheids of the host tissue also become stunted and contorted in shape. These observations are in agreement with those of other investigators on American host species for Arceuthobium.
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