Athelia arachnoidea is a corticioid fungus in the family Atheliaceae.

The species forms thin, white, cobwebby basidiocarps (fruit bodies) and typically occurs saprotrophically on leaf litter and fallen wood.

It can, however, also be a facultative parasite of lichens[1] and can additionally be a plant pathogen (typically found in its asexual Fibularhizoctonia carotae state),[2] causing "crater rot" of stored carrots.

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