Athelia arachnoidea

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.

Athelia arachnoidea
Athelia arachnoidea growing on Thuja orientalis in Lasi, Romania
Scientific classification
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)