Russula prolifica

Overview

Russula prolifica is an ectomycorrhizal brittlegill, known in English as the Malagasy market brittlegill. The catalogue records it as an economically important market mushroom in Madagascar, sold wild.

How to recognise a brittlegill

A mushroom is a brittlegill, a Russula, only when several features line up. The cap is usually brightly coloured. The gills are brittle: they snap when you try to bend them, and the flesh breaks cleanly like chalk instead of tearing into fibres. The stem carries no ring and no cup or sack at its base, and there are no veil remnants on the cap. The gills are attached to the stem, and a spore print is white, cream or dark yellow.

Two checks separate Russula from its look-alikes. Break a gill or cut the flesh: a brittlegill gives no milky juice, while a milkcap (Lactarius or Lactifluus) weeps latex. Then look at the stem. A ring on the stem, a cup or a sack or bulb with torn remnants at its base, or flesh that tears in fibres points away from Russula and towards Amanita, a genus that includes the deadly death cap and many other poisonous species. A mushroom with a ring or a cup at the base is not a Russula, whatever colour its cap is.

Recognising the genus is much easier than naming the species. Cap colour varies widely inside one species, so experts rely on the colour of the spore print, the taste, colour changes in the flesh, how far the cap skin peels, chemical tests and the microscope. A collector who is sure of the genus but not of the species should treat the species as unidentified.

The taste test, and what it cannot tell you

Foragers have long sorted brittlegills by taste. Break off a small piece of cap flesh or gill, chew it for several seconds and spit it out without swallowing; the burn of an acrid species can take half a minute to build. Brittlegills that taste mild are the traditional edibles. Those that taste hot, peppery or acrid, and many bitter ones, are left alone because they irritate the stomach and bowel and can cause vomiting and diarrhoea.

The method works only inside the genus. Use it once the mushroom is positively a Russula, never to decide whether an unknown mushroom is safe: the deadliest mushrooms do not taste unpleasant, and a mild taste says nothing about an Amanita, a Cortinarius or any other family. Within Russula it is a screen for rejecting species, not proof of safety. Some mild species are poor eating, rare species are poorly documented, and a few brittlegills have been linked with poisoning. Cook what you eat, start with a small portion, and identify to species where you can. This record is not a field guide.

Eucalyptus plantations

Buyck's 2008 study in Economic Botany reports that Eucalyptus robusta plantations supply by far the bulk of the edible mushrooms sold in Madagascar, especially Russula and Cantharellus species. The species is associated with eucalypt plantations in Madagascar.

Origin question

A 2023 Australian Journal of Taxonomy paper by Buyck and colleagues asks whether the species is a recent introduction from Australia. It compares it with R. discolor, a closely similar species that associates with eucalypts in south-western Australia.

Market handling and use

The 2023 paper notes that russulas are sold at almost any market in Madagascar, most often after the cap cuticle has been removed. That describes russulas as a group and is not a preparation method for this species.

The catalogue says this record is not an identification or preparation guide, and nothing here establishes safety for home use.