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Abstract: In the study of fruiting in the cultivated mushroom it is necessary to investigate the factors affecting the formation and development of the mycelial strands from which the primordia of the sporophores originate, Hein (10 and 11) and Sarazin (15). This paper describes experiments done between 1959 and 1962 on the development of mycelium and mycelial strands in the compost and casing layer. Apart from the fact that sporophores arise from mycelial strands little is understood of their function or of the factors which influence the formation of primordia on them. Garrett (8 and 9) suggests that the mycelial strands transport food to support the colonisation of more distant parts of the substrate and that, in a strand, there is a pooling of resources of the individual hyphae with a consequent increase in the inoculum potential and the momentum of growth. Hein (10) supports the view that mycelial strands serve to transport food, and further suggests that the larger cells in the strands may act as food reservoirs. Hein (10) has reviewed much of the earlier published work and described the structure and formation of mycelial strands. Further observations have been made by Mathew (12), who found that the morphogenesis of mycelial strands in the cultivated mushroom was very similar to that already described for Merulius lacrymans and Phymatotrichum omnivorum, but differed from the type of strand morphogenesis described for Helicohasidium purpureum. Adjacent, parallel hyphae became bound together and covered by a profuse development of thin walled, aseptate, finer branches; development of strands was acropetal.
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