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Athelia arachnoidea
Athelia arachnoidea growing on Thuja orientalis in Lasi, Romania
Scientific classification
Domain:	Eukaryota
Kingdom:	Fungi
Division:	Basidiomycota
Class:	Agaricomycetes
Order:	Atheliales
Family:	Atheliaceae
Genus:	Athelia
Species:	A. arachnoidea
Binomial name
Athelia arachnoidea (Berk.) Jülich, (1972)
Synonyms
Corticium arachnoideum Berk. Terana arachnoidea (Berk.) Kuntze Athelia epiphylla var. arachnoidea (Berk.) Krieglst. Hypochnus bisporus J. Schröt. Corticium bisporum (J. Schröt.) Bourdot & Galzin Corticium centrifugum subsp. bisporum (J. Schröt.) Bourdot & Galzin Athelia bispora (J. Schröt.) Donk Rhizoctonia carotae Rader (anamorph) Fibularhizoctonia carotae (Rader) G.C. Adams, & Kropp (anamorph)

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 and can additionally be a plant pathogen (typically found in its asexual Fibularhizoctonia carotae state), causing "crater rot" of stored carrots.

References

1. Motiejûnaitë J. (2005). "Epidemiology of the fungus Athelia arachnoidea in epiphytic communities of broadleaved forests under strong anthropogenic impact". Ekologija. 4: 28–34. http://www.ebiblioteka.lt/resursai/LMA/Ekologija/0504_07_Eko.pdf
2. Adams GC, Kropp BR. (1996). "Athelia arachnoidea, the sexual state of Rhizoctonia carotae, a pathogen of carrot in cold storage". Mycologia. 88 (3): 459–472. doi:10.2307/3760886. JSTOR 3760886.

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