Waxcap grasslands: habitat hidden under turf

A sward can look like an ordinary short lawn while holding a fungal assemblage that has developed over decades. So-called waxcap grasslands are recognised by a richness of waxcaps, earthtongues, club and coral fungi, and certain pinkgills. Their colourful fruiting bodies appear in autumn, but most of the organism remains in the soil. A single inspection out of season will easily miss the value of the whole site.

What the most valuable grasslands have in common is a long period without intensive fertilising, ploughing or chemical improvement of productivity. An excess of nitrogen and phosphorus changes the vegetation and the soil conditions, and many characteristic fungi disappear. Two opposite scenarios are equally damaging: conversion into an intensive lawn, or abandonment of mowing and encroachment by scrub. Protection requires light, regular use suited to the place.

Plantlife recommends first establishing the full assemblage over several visits, and then maintaining low fertility. Cut material should be removed, because a swathe left in place returns nutrients to the soil. Fertiliser, lime, fungicide and scarification should not be applied automatically. In a cemetery, on a golf course or on urban turf, agreement is needed between the manager, a naturalist and the maintenance team — an incidental "renovation" can destroy value that is invisible in spring.

Fruiting bodies alone are not a sufficient basis for assessing a population. Their number depends strongly on the weather, and an absence in one year does not prove the mycelium has gone. Photographic documentation, the date, the area and a repeatable walked route make it possible to compare seasons. The most important thing a picker can do is leave rare specimens where they are and pass the observation, with a safely generalised location, to specialists or the site manager.

The score is a screen, not a verdict

Plantlife's guide proposes a field screen: waxcap colour groups plus coral fungi and earthtongues receive points; 0–4 suggests low apparent interest, 5–11 warrants further checking, and 12–29 indicates good grassland needing expert survey. The authors warn that a low score after a dry autumn or in dense vegetation does not rule out value and that sites are best revisited over several years. This is a Welsh educational tool, not a legal designation or universal European threshold. It partly uses colour groups and cannot replace microscopic identification; Hygrocybe sensu lato taxonomy has also changed. Management must reflect each site's history and hydrology rather than one score alone.