These look absolutely Cthulhoid, especially when the plate is placed on its side like this

It's the The 63rd plate from Ernst Haeckel's Kunstformen der Natur, (1904) depicting Basimycetes, from WikiMedia Commons. You can click on the picture to make it bigger. They look like they came straight out of the Cthulhu Mythos.

I came across the illustration in Wired's The Magic of Mushroom Spores by Brandon Keim.

Of course, if you've read Brian Lumley's Necroscope books, you know that evil vampiric spores can be very, very dangerous.