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Images of British Lichens

Lichenomphalia hudsoniana (H.S.Jenn.) Redhead, Lutzoni, Moncalvo & Vilgalys
(= Omphalina hudsoniana (H.S. Jenn.) H.E.Bigelow;
Omphalina luteolilacina (J.Favre) D.M. Henderson;
Phytoconis luteolilacina (H.S.Jenn.) Redhead & Kuyper;
Botrydina viridis (Ach.) Redhead & Kuyper;
Coriscium viride (Ach.) Vain.)

A basidiolichen with the thallus composed of bluish green, discoid squamules ('Coriscium viride'), and a toadstool for the fruitbody: cap omphalioid, pallid white, pale cream, pale or bright yellow, or (rarely) apricot, somewhat waxy in appearance, with a striate to sulcate, crenulate margin, gills paler, decurrent, stipe white to pale yellow, usually tinged lilac when young, typically 1–2 × cap diameter, surface minutely but densely pubescent. Microscopically the tissues lack clamp connections, gill trama of narrow, thin-walled, bidirectionally branched hyphae, spores ochre yellow in deposit (fide Elborne), ellipsoid, 6.5–9.5(–10)×4.5–5.5 µm (measurements from Elborne, 2008). On damp, peaty soil, generally at higher altitudes, but not uncommon at lower altitudes in exposed situations, reportedly occasionally on well rotted wood and other peaty debris.

Refs: Elborne (2008), 224, (2012), 294; Smith et al. (2009), 554; Purvis et al. (1992), 404 (as Omphalina); Favre (1955), 45, plate IV,9 (colour illustration, as Omphalia luteovitellina); Barrasa & Rico (2001), 376-379 (photomicrographs, as Omphalina); Dobson (2005), 287 (photos, as Omphalina); Dobson (2011), 257-8 (photos); Dalby & Dalby (2005), 17 (photo, as Omphalina, squamules only); Buczacki et al. (2012), 198-9 (colour illustration); Jahns (1983), 260-1 (photo, squamules, as Coriscium viride); Ryman & Holmåson (1984), 258 (photo, as Omphalina); Holien & Tønsberg (2008), 206 (photo); Moberg & Holmåson (1984), 222 (photo, as Omphalina); Stenroos et al. (2011), 258 (photo, shows yellow variant well); Wirth (1995), 2: 618-9 (photo, as Omphalina); Wirth, Hauck & Schulz (2013), 2: 702 (photo); Breitenbach & Kränzlin (1991), 190-1 (photo, as Gerronema hudsonianum); Gulden et al. (1985), 13 (photo, as Omphalina); Hinds & Hinds (2007), 298 (photo, squamules only).

Differs from other Lichenomphalia species in the squamulose, Coriscium thallus. Deeper yellow variants can be confused with L. alpina, but this lacks the Coriscium squamules, has a ± smooth stem and quite different spores. The two species quite often occur in the same locations, but seem to have rather different ecology, L. hudsoniana on peaty mineral soil, L. alpina on pure peat. If on peaty debris from rotted coniferous wood, confusion with the non-lichenised Chrysomphalina grossula is also posible (Coriscium squamules would be absent but beware of immature Cladonia). Yellow or yellowish variants may also closely resemble non-lichenised, montane Hygrocybe species, notably H. citrinopallida, H. xanthochroa and H. lilacina, the latter two also with lilac on the stem.

Lichenomphalia hudsoniana
Lichenomphalia hudsoniana
 Material from peaty soil near the summit, the Cairnwell, south Aberdeenshire, 1980.  Note that in the lower photograph, the squamules in the centre of the photograph are most likely Cladonia strepsilis. ('Coriscium' squamules to the left.) 

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Uploaded January 2011, last updated September 2013