Cottony Volva Amanita

Amanita xylinivolva is a small to medium-sized mushroom with a yellow to yellowish cream or buff-colored cap. The margin of the cap exhibits sulcate to tuberculate-sulcate striations. Fragments of the cottony, pale universal veil may be present on the cap surface or at the junction of the stipe and its swollen bulb. The species was previously collected in 1978 by Guzmán and Carela, who initially identified it as a member of the Amanita gemmata group. It can be distinguished from A. gemmata by its predominantly subglobose spores.

Amanita xylinivolva was first discovered when they were found in the Andes of Colombia growing with Quercus humboldtii and Weinmannia tomentosa. Some reports say it grows in Guatemala, but the full range is not known.

The name xylinivolva comes from the Greek xylinus (meaning "cottony" or "pertaining to cotton") and volva, referring to the distinctive cottony, submembranous material of the universal veil.