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Figure 7 
Fig. 7 Spore strain variations in high density mycelium of Morchella angusticeps from Michigan.
Single germinating ascospores from the same mushroom were used for inoculum (two per plate); so the variables on a plate were intrinsic to the mycelium rather than due to cultural conditions. The sample is 4 typical plates out of 12 inoculated. The petri plates were 90 mm inside diameter.
A barrier forms between mycelia of different spores strains, which prevents phenotypes from mixing. This phenomenon was first observed by Hervey et al., 1978, but they did not understand the function. They referred to the barrier as a meld. Tom Volk showed that the barrier does not form about 2% of the time, which indicates that some gene exchange is allowed. Media Compositions: dextrose 2%, casein hydrolysate 0.5%, arginine HCl 0.5%, k-acetate 0.1%, Wickerham's basal medium pH 7.0 and agar 2%. text Fig. 7.
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