The species has originally been described as Entoloma jennyae (orthographic variant).
Entoloma jennyi is a striking agaric with large basidiocarps with a pruinose, blue-grey to violaceous blue pileus of 4-7 cm, pink lamellae and whitish stipe. The surface of the pileus is made up of erect clavate cells, a fundamental difference with somewhat similar species (Noordeloos, 1994). The species has a very limited distribution in Western Europe and is growing in an endangered habitat. Therefore it is proposed for the global Red List. The larger blue species of Entoloma have been studied extensively throughout Europe (Noordeloos, 1992, 2004) and therefore it is unlikely that it is overlooked in large areas. In view of the very small population E. jennyi is proposed for the global Red List as Endangered (D1).
Entoloma jennyi is only known from a few localities in Ireland. Legon & Henrici (2005) mention two localities. It may occur in reality in some as yet unknown localities, with an estimated number of ten localities worldwide.
Only known from a few localities in Ireland (Noordeloos, 2004). Including undiscovered localities the global population is estimated at a maximum of 10 localities with a maximum number of 200 mature individuals.The trend of the species is unknown, but because a decline of the habitat and habitat quality (see threats) most probably the trend has been decreasing.
Population Trend: Deteriorating
On wet, peaty soil in Atlantic bogs with Calluna vulgaris, Erica cinerea, Narthecium ossifragum, Potentilla erecta, Polygala vulgaris; probably saprotrophic but life strategy unknown.
Entoloma jennyi is threatened by continued digging of peat; drainage and cultivation of bogs and planting of trees in drained bogs.
Preservation of localities as nature reserves with maintenance of natural hydrology.
Systematic mapping of appropriate habitats in Ireland (possibly also Wales and Scotland) may reveal more localities of this species.
Noordeloos, M.E. 1992. Entoloma sl. Fungi Europaei 5.
Noordeloos, M.E. 1994. Studies in Entoloma 14. Some new species and new records. Österr. Z. Pilzk. 4: 119-136.
Noordeloos, M.E. 2004. Entoloma sl, supplemento. Fungi Europaei 5a.
Legon, N.W. & A. Henrici. 2005. Checklist of the British and Irish Basidiomycota.