Hapalopilus rutilans

Hapalopilus rutilans
Hapalopilus rutilans with purple alkali stains
Scientific classification
Domain:	Eukaryota
Kingdom:	Fungi
Division:	Basidiomycota
Class:	Agaricomycetes
Order:	Polyporales
Family:	Polyporaceae
Genus:	Hapalopilus
Species:	H. rutilans
Binomial name
Hapalopilus rutilans (Pers.) Murrill (1904)
Synonyms[1]
List Boletus suberosus Bull. (1791) Boletus resupinatus Bolton (1792) Boletus rutilans Pers. (1798) Boletus spongiosus Pers. (1801) Polyporus rutilans (Pers.) Fr. (1818) Polyporus nidulans Fr. (1821) Polyporus spongiosus (Pers.) Fr. (1821) Poria spongiosa (Pers.) Gray (1821) Boletus nidulans (Fr.) Spreng. (1827) Polyporus nidulans var. spongiosus (Pers.) Fr. (1838) Trametes lignicola var. populina Rabenh. (1854) Leptoporus rutilans (Pers.) Quél. (1876) Hapalopilus nidulans (Fr.) P.Karst. (1881) Inonotus nidulans (Fr.) P.Karst. (1881) Inodermus rutilans (Pers.) Quél. (1888) Polyporus nidulans subsp. spongiosus (Pers.) Sacc. (1888) Fomes spongiosus (Pers.) Sacc. (1888) Inonotus rutilans (Pers.) P. Karst. (1889) Polystictus nidulans (Fr.) Gillot & Lucand (1890) Cyphella rutilans (Pers.) Costantin & L.M. Dufour (1891) Polyporus rutilans var. nidulans (Fr.) Costantin & L.M. Dufour (1891) Fomes resupinatus Massee (1892) Scindalma spongiosum (Pers.) Kuntze (1898) Phaeolus nidulans (Fr.) Pat. (1900) Phaeolus rutilans (Pers.) Pat. (1900) Poria resupinata (Massee) W.G. Sm. (1908) Polystictus rutilans (Pers.) Bigeard & H. Guill. (1913) Hemidiscia rutilans (Pers.) Lázaro Ibiza (1916) Phaeolus rutilans f. abietis-sibiricae Bourdot (1932) Phaeolus rutilans f. porioides Bourdot (1932) Agaricus nidulans (Fr.) E.H.L.Krause (1933) Phaeolus rutilans f. resupinatus Pilát Boletus versicolor sensu Schaeffer

Hapalopilus rutilans Mycological characteristics
	Pores on hymenium
	Cap is convex
	Hymenium attachment is not applicable
	Lacks a stipe
	Spore print is white
	Ecology is saprotrophic
	Edibility is poisonous

Hapalopilus rutilans is a species of polypore fungus in the family Polyporaceae. Officially described in 1821, it was transferred to its current genus Hapalopilus six decades later. It is commonly known as the tender nesting polypore, purple dye polypore, or the cinnamon bracket. This widely distributed species is found on five continents. It grows on the fallen or standing dead wood of deciduous trees, in which it fruits singly, in groups, fused, or in overlapping clusters. Fruit bodies are in the form of kidney-shaped to semicircular, cinnamon-orange-brown brackets. The underside of the fruit body features a yellowish to brownish pore surface with tiny angular pores, from which spores are released.

The toxic fruit bodies are neurotoxic if ingested, an effect attributable to the compound polyporic acid, which is present in high concentrations. When an alkaline solution is placed on the fungus, the flesh turns violet. The fungus is used in mushroom dyeing to produce purple colors.