Russula viridirubrolimata

Overview

Russula viridirubrolimata is a wild mushroom of the genus Russula, the brittlegills. The species name is attributed to J.Z. Ying in the catalogue that lists it. Its Chinese name is 绿边红菇.

The species appears as entry 1439 in the Russula list of "Species cataloging of edible and medicinal fungi in China", published in Mycosystema in 2026. That catalogue marks it as edible (食用).

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.

What the catalogue does and does not establish

The catalogue is a species checklist. The catalogue’s own notes on the entry treat the record as a checklist lead: the edibility listing rests on the checklist, and direct evidence of local consumption, with its preparation, was not found in the sources read.

No habitat, season, distribution within China beyond the catalogue, traditional preparation or culinary use is recorded for this species in the sources read. The name has also not been matched in the sources read against other published accounts, so the species concept should be checked before relying on the name.

Safety

Russula contains toxic species, and cap colour does not reliably separate edible brittlegills from poisonous ones. A checklist entry that marks a species as edible does not give a preparation, a dose, or a method for telling it apart from look-alikes.

Anyone who finds this mushroom should identify it with a local mycologist or a regional identification source before any use, and should not rely on taste or smell as a test.