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Abstract: Although fungal physiology has been the subject of considerable investigation, little is known with any precision about the factors involved in the transpiration of mushrooms. It has been shown that the increasing dry weight in the developing fruit bodies of Collybia velutipes (Plunkett,1951), Agaricus campestris (Bonner et al., 1956), and Coprinus lagopus (Madelin, 1956 a and b ) is due to the flow of the materials other than water into the mushrooms during their development. Buller (1933) has suggested that a pressure from below, developed as a result ofthe formation of new protoplasm and vacuoles in the mycelium, causes an acropetal flow of the protoplasm into the fructification through an intrahyphal rout of transport. In this connection it is important to note that the septa of mushroom hyphae possess a central pore through which protoplasm may flow (Wahrlich, 1893). According to Schutte (1956) translocation is dependent upon a "vital" phenomenon in Agaric fructifications which, although sensitive to evaporation, is mainly actuated otherwise than by evaporational suction. Plunkett (1958) showed a:reasonable correlation between transpiration and' translocation with Polyporus brumialis. He concluded that translocation in P. brumalis probably Involves an indispensable vital component although the movement is mainly due to evaporation. On the contrary in agarics, under the conditions used by Schutte (1956) the vital component dominates the process and evaporation is subsidiary and' dispensable. Littlefield (1966), using an isotope technique studied the transport of nutrients through the stipe of Collybia but made no attempt to elucidate the transport mechanism. The objective of the present work was to investigate carefully the process of transpiration in some common mushrooms.
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