I was given a Kodak carousel slide tray full of old slides from the early '60s through the early '70s. I've started scanning some of the more interesting shots, and I've begun to notice a strange "spider-like" thing on some of them. Is this fungus? Samples below. In scanning these, is there any risk that the fungus could contaminate my film scanner and attack other slides/negs that I plan to scan in the future (which are currently fungus-free to the best of my knowledge)?