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Species Information
Summary: Features of this rare fungus are 1) thin, waxy, pink, resupinate growth on overwintered culms and senescent leaves of orchard grass and a sedge species, 2) spores that are 13-16 x 7-9.5 microns, elliptic, smooth, inamyloid, and colorless, 3) 2-spored basidia, and 4) a monomitic hyphal system, the hyphae with clamp connections.
Limonomyces culmigenus has been found in BC (Ginns) and Europe (Stalpers).
Fruiting body: resupinate, effused, adnate [firmly attached], ceraceous [waxy], very thin; pink; even, (Stalpers), invisible to the naked eye, the presence of the fungus revealed as very thin pink patches under a lens or low-power microscope, when the projecting basidia may be seen, (Buczacki)
Microscopic: SPORES 13-16 x 7-9.5 microns, elliptic to pip-shaped, smooth, inamyloid, colorless, thin-walled, distinctly apiculate; BASIDIA (1)2(3)-spored, (25)50-150(215) x 7-12 microns, typically urniform, originating from probasidia, probasidia 14-25 x 5-10 microns, metabasidia basally 3.5-4.5 microns wide, occasionally arising laterally rather than terminally on the probasidium, sterigmata 5-12(13.5) microns long, stout, curved; HYPHIDIA absent; HYPHAE monomitic, 2-4 microns wide, branched, colorless, thin-walled, with clamp connections, (Stalpers), spores 13-15 x 7-9.5 microns, variable, +/- elliptic, smooth, inamyloid; basidia 1-2-spored, with stout curved sterigmata, very variable, usually "with long tapering stalk and club-shaped apex", 25-55 microns long; cystidia absent; hyphal system monomitic, (Buczacki)
Habitat / Range
on Dactylus glomerata (orchard grass) and Carex sp., (Stalpers), parasitic; fruitbodies "produced on overwintered culms and senescent leaves", (Ginns), mainly winter; on grasses especially Dactilis (cock''s-foot), "also perhaps on sedges and rarely on other organic substrates" including old fungal fruitbodies, (Buczacki)
Similar Species
Limonomyces roseipellis is also a pink basidiomycete found on grasses, but spores are smaller, and basidia are typically 4-spored, (Stalpers). Laetisaria fuciformis, another pink basidiomycete on grasses, is widespread in humid and cool temperate areas of Europe, North America, and Australasia: it lacks clamp connections, and has "red threads" (masses of conglutinated parallel hyphae) that are separate from the rarely seen effused fruitbodies, (Stalpers). L. fuciformis has been recorded specifically for Maryland and Rhode Island, but as the name Corticium fuciforme has been used for collections of Limonomyces roseipellis, the records only include those which say that the fungus lacked clamp connections, (Ginns).
