Breeding
Every fungus forms a spore print each minute (up to 4): collect it with a glass bottle. A spore print is planted by using it on soil. Prints of an unmated fungus are clones; a fused sporangium gives crosses with a partner. Each offspring gets one allele per gene from each parent.
Level 4 only appears by mutation (3% per allele, more with a mutagen). Keep the best, cross the carriers: about a quarter of their young carry it twice and then breed true. Start with Thrift: it pays for everything else.