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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.

The second way is by the staining. In most collections of crocodilinus the flesh will stain orangish and then reddish at least when young in the stem. The process can take minutes or hours depending on temperature and moisture. I have never seen arvensis do that. The reddening is also mentioned in many European texts for macrosporus, a synonym of crocodilinus.

The first photo attached is of the mushrooms you sequenced. The red-staining was very slight. The second photo is from the same mycelium but a couple years ago during moist weather, and the staining was more obvious."


Copyright © 2016 David Arora
Copyright © 2019 David Arora
ITS phylogenetic tree

Proposed Names

95% (3)
Recognized by sight: Stains orange, and then red
Based on microscopic features: Has some extremely large spores among the normal ones.
Based on chemical features: ITS sequence matches 100% with the other A. crocodilinus sequences in Genbank

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= Observer’s choice
= Current consensus


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