Shield Pinkgill

The Shield Pinkgill is the classic spring Entoloma of hedgerows, scrub and orchards. It appears in April and May, well before most autumn fungi, and its timing combined with a strict association with members of the rose family makes it comparatively straightforward to place.

The English and scientific names both refer to the cap, which is broadly umbonate and shield-like in profile, grey-brown and silky, often with darker radial streaks. Beneath, the gills pass through the familiar Entoloma sequence from whitish through grey to salmon-pink.

It belongs to the Entoloma clypeatum group, a cluster of closely related spring species associated with different Rosaceae hosts, several of which have been given separate names on the basis of host, spore size and cap details.

Cap

The cap is 4-10 cm across, conical to convex when young, expanding to flattened with a distinct broad umbo and an often wavy, irregular margin. It is grey-brown, mouse-brown or clay-brown, hygrophanous, drying paler from the centre, with a silky surface bearing darker innate radial fibrils and sometimes water-spotting.

Gills

Gills are sinuate to adnexed, moderately crowded, and whitish to pale grey at first, becoming grey-pink and then salmon-pink as the spores mature. The gill edge is even and concolorous.

Stipe

The stipe is 4-9 cm tall and 0.5-2 cm thick, cylindrical or slightly swollen at the base, solid then hollowing, whitish to pale grey-brown, silky-fibrillose and often longitudinally striate. There is no ring and no volva.

Flesh and spore print

Flesh is white to greyish and does not change appreciably when cut. The smell is strongly farinaceous. The spore print is pink, with angular spores of five to seven facets.

Shield Pinkgill grows on the ground beneath members of the rose family: hawthorn and blackthorn hedges, wild and cultivated rose, plum, apple, pear, rowan and Prunus scrub. It is a fungus of hedgerows, scrubby field margins, orchards, gardens and woodland edges rather than deep woodland.

It fruits early, typically from April to June, often in troops, arcs or dense clusters under the host shrubs, and can appear again after unusually wet late springs. The species is widespread across Europe and temperate Asia and is recorded in North America. Its association with hedgerow shrubs makes it a familiar sight along old field boundaries.

Entoloma clypeatum is generally treated as forming a mycorrhizal or at least closely biotrophic association with the roots of Rosaceae hosts, an unusual arrangement given that most rose-family shrubs are otherwise arbuscular mycorrhizal. The consistency of the host link, the fruiting in arcs around individual shrubs and the annual return to the same bushes all support a root-based relationship.

The mycelium is perennial around the host root system and produces its flush in spring, exploiting soil moisture before summer drying. Where a hedge is grubbed out, the fungus disappears with it, so the species is effectively tied to the persistence of the hedgerow itself.

The St George's Mushroom (Calocybe gambosa) fruits at exactly the same season in grassland and hedge banks and shares a strong farinaceous smell, but it is white to cream throughout, with very crowded white gills and a white spore print, never grey-brown with pink gills.

Other members of the E. clypeatum group, such as Entoloma saundersii under elm and Entoloma sepium under blackthorn and plum, differ in host, spore size and cap tone and often need microscopy. Entoloma sinuatum is much larger, ivory-grey and autumn-fruiting in broadleaf woodland. Spring Tricholoma and Melanoleuca species can look similar in stature but produce white spore prints, so a print on dark paper settles the matter.