Of this collection, David Arora said: "The scaliness is weather-dependent. But there's two easy ways to tell it from arvensis. First is the giant spores in crocodilinus (up to 14 um) scattered among smaller ones. They don't even have to be measured to see that they are huge. After examining many collections here I stopped because every one was crocodilinus. I used to find arvensis a lot in Santa Cruz but it disappeared from that area in the early 1990s.