Echigoshirayukidake (Basidiomycetes-X)

Basidiomycetes-X (a hyphal mass)
Basidiomycetes-X (a hyphal mass)
Scientific classification edit
Kingdom: Fungi
Phylum: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Agaricaceae
Genus: Agaricus
A. b. x Basidiomycetes-X
Binomial name
Agaricus blazei x Basidiomycetes-X

Echigoshirayukidake (Japanese: 越後白雪茸), commonly called Basidiomycetes-X or BDM-X, is a hybrid of Agaricus blazei, but may be considered a new species.[1] It is classified as a basidiomycete because of its beak-shaped processes (Clamp connections). It does not form basidia and only forms sclerotia (hyphal masses) when cultured. In these respects, BDM-X is distinguished from other basidiomycetes. BDM-X is cultured and consumed as an edible mushroom.


Basidiomycetes-X can be cultured by an ordinary method. A cultured strain or the seed of BDM-X can be aseptically inoculated into agar, liquid, or sawdust media with suitable nutrients, and is cultured under appropriate temperature conditions. The optimum growth conditions are at pH 5.0 to 6.0 and at 22 to 26℃.

BDM-X forms hyphal masses in light pink colonies crowded with hyphae on the media. These sometimes grow concentrically from the site of inoculation. If a group of hyphal masses is formed within the medium, they are interconnected by mycelial strands to form a large hyphal mass.

As the shape of BDM-X depends on the environment in which it is cultured, the large hyphal masses of BDM-X for industry use can be formed, for example, on a sawdust medium (10 cm×10 cm×20 cm) after one year cultivation.



  1. ^ Watanabe, T; Nakajima, Y; Konishi, T (2008). "In vitro and in vivo anti-oxidant activity of hot water extract of basidiomycetes-X, newly identified edible fungus" (PDF). Biological & Pharmaceutical Bulletin. 31 (1): 111–7. doi:10.1248/bpb.31.111. PMID 18175952. Retrieved 3 April 2018.