OK, so why does this lichen look like it is growing mushrooms, even though these are decidedly not mushrooms? My first answer is "just to fuck with you," but D. absoluta evolved long before humankind, nonetheless you specifically. So my second answer is because the mushroom shape just makes functional sense when you want to produce a fruiting body by maximizing the physical area that produces spores, and raising them above the substrate by a thin stalk so they can get caught in and distributed by wind. Ok, so they are the spore producing structure of fungi, shaped like that, how are they not mushrooms? Mushrooms are we typically think of them are the reproductive structures of basidiomycete fungi, the spores are typically released from the lower surface of the fruiting bodies like this:
And in an ascocarp, the reproductive structure of an ascomycete fungi like that of D. absoluta, the spores are released from the upper surface of the fruiting bodies. So like this:
OK this is waaayyy simplified. There are also a bunch of internal physiological differences but you, dear reader, can look those up yourself if you are curious about the nuances of fungal development. But very generally speaking, basidiospores come out the bottom, ascospores come out the top.
So not tiny mushrooms, but very very cute just as they are!
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