Nematophagous Fungi: Guide by Philip Jacobs, BRIC-Version

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Hohenbuehelia petalodes / Nematoctonus geogenius

Hohenbuehelia petalodes (BULLIARD : FRIES) SCHULZER 1866
[ = Agaricus petalodes BULLIARD 1785 ]
[ = Agaricus petaloides BULLIARD : FRIES 1821 ]
[ = Hohenbuehelia geogenia (DC. : FRIES) SINGER 1951 ]

Genus: Hohenbuehelia SCHULZER 1866
Tribus: Resupinateae SINGER 1948
Family: Pleurotaceae
Order: Tricholomatales
Subclass: Agaricomycetes
Class: Basidiomycetes
Division: Eumycota

(System according to BON 1988)

Anamorph:
Form Species: Nematoctonus geogenius THORN et BARRON 1986
Form Genus: Nematoctonus DRECHSLER 1941
Form Subfamily: Hyalosporae
Form Family: Moniliaceae
Form Order: Moniliales (Hyphomycetes)
Form Class: Deuteromycetes (Fungi imperfecti)
Division: Eumycota

(System of anamorphs according to SACCARDO 1886)

Conidia of Hohenbuehelia petalodes / Nematoctonus geogenius

The mushrooms of the genus Hohenbuehelia are cellulose reducers often found on decaying wood. As saproparasites they are also able to attack wood of impaired trees and shrubs (SINGER 1975; THORN & BARRON 1986).
The anamorphs of the genus Hohenbuehelia are reckoned to the form genus Nematoctonus DRECHSLER (BARRON & DIERKES 1977).
Hohenbuehelia petalodes develops elongated-spatulate, up to 12 cm large fruit bodies with a beige-brown to grey top and whitish gills descending at the lateral stalk (BON 1988; BUCZACKI 1989). The trama consist of an upper pigmented, 70-100 µm thick and a lower hyaline, gelatinous, 0.7-3 mm thick layer (THORN & BARRON 1986).
The hyaline, 5.5-7.5 µm long and 3.5-4.5 µm broad basidiospores as well as the conidia are able to germinate forming adhesive, hourglass-shaped knobs and to infect nematodes (THORN & BARRON 1984).
The mycelium develops 9-16 µm long and 3-4.5 µm broad, single-celled, elliptical conidia on short sterigmata (Abb. 1). It is also able to develop hourglass-shaped adhesive knobs in some strains (THORN & BARRON 1986).

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Clamp mycelium and hourglass-shaped adhesive knobs of Hohenbuehelia petalodes / Nematoctonus geogenius with captured nematode