on log – The Mushroom Diary – UK Wild Mushroom Hunting Blog

Here we have a fairly common and sought after tasty mushroom for this time of the year. It likes to grow in dense clusters on stray stumps and logs of broad-leaved trees – Just like many other brown toadstools too! Hmm!?

The Sheathed Woodtuft (Kuehneromyces mutabilis) has also adopted other common names, such as Velvet Toughshank, Brown Stew Fungus and Two-toned Pholiota, even though it is not strictly a Pholiota species. But I have seen it named as ‘Pholiota mutabilis’ somewhere else. It just goes to show that scientific names change from time to time as the scientific knowledge of fungi continually advances.

And talking of scientific names ‘mutabilis’ literally means ‘changeable’ in latin. A good choice of name I think, because the caps of this mushroom which are ‘shiny and brown’ (even orange-brown – see last pictures below) when moist can change to paler ochre from the centre outwards as it dries. This gives them the characteristic two-toned appearance.

On discovering any type of brown mushrooms on dead wood, most people become instantly suspicious. I don’t blame them at all. Unless you are familiar with other brown woodland species, identification can be a challenge. It has been known to be confused with Honey Fungus, Velvet Shank and Sulphur Tuft all of which grow in similar numbers on dead wood and share certain visual characteristics.

The main identification concern here though is the deadly Funeral Bell (Galerina marginata). Nature has thrown this one into the mix just to annoy and terrify the average mushroom hunter. I don’t currently have any images to show, but if you look elsewhere you’ll see what I mean. The cap can look frighteningly similar in size and shape and also dries lighter brown at the centre (again, depending on moisture level). Fortunately, one reliable comparison is that it has a ‘smooth and silvery’ stem, whereas the Sheathed Woodtuft’s brown scales (beneath the ring) are unmistakable.

Other features such as location, time of year, gills and spore print are not effectively reliable for comparison. So it goes without saying that if you intend to eat them, take extra care in the identification process. If you’re 100% happy just try a small portion first, leave it 24 hours to see how you go, just like you should with all mushrooms you eat for the first time. There’s always a small possibility of an allergic reaction, but fear not, for if it is the Sheathed Woodtuft, it won’t kill you!

I have to admit, the general appearance of this mushroom hasn’t inspired me to eat it, but apparently it is known to be very good with a pleasant nutty taste. But I’m willing to give it a go soon. I think!

In groups on logs and stumps in woodland the Sheathed Woodtuft (Keuehneromyces mutabilis). Notice the scales beneath the ring on the stem. This feature is NOT on the similar and deadly Funeral Bell (Galerina marginata)

A slightly younger and fresher group of Sheathed Woodtufts, much more Orange/Ochre in colour.

QUICK ID TABLE: SHEATHED WOODTUFT / BROWN STEW FUNGUS Kuehneromyces mutabilis

CAP / FLESH

3-7cm across. Initially convex shape then flattenned out; often umbonate (with a small bump). Orange-brown to brown. Becomes lighter in the centre as it dries, giving a two-toned colour effect.

STEM

3-8cm x 0.5-1cm. Whitish at the apex, darker towards the base. Smooth above the ring, finely scaly below.

GILLS / SPORE PRINT

Adnexed. initially pale then later cinnamon-brown.
Spore Print: Deep yellow-brown (see how to take a spore print here).

HABITAT / SEASON

In dense clusters on stumps and standing/fallen trunks of deciduous trees. In many numbers. Spring to early winter

EDIBILITY

Edible and good. Take care not to confuse with Galerina marginata (The Funeral Bell) a deadly lookalike; focus on the stem differences.

There’s a extremely good chance of you finding a large group of Sulphur Tuft (Hypholoma fasiculare) at just about anytime of the year (especially from April to December). These beauties are extremely common in the UK and populate all types of woods and forests.

They are Saprotrophs (feeding off decaying matter) and appear in small tufts or large groups on dead/rotting wood (deciduous or coniferous), tree stumps or underground buried decaying wood or roots. The Hypholoma group of fungi like these are commonly known as ‘Brownie’.

When found in great numbers they are indeed a great sight to behold. When in their prime, the convex cap has an amazing bright sulphur-yellow colour with darker orange tones towards the centre. Remnants of the pale yellow veil (initially covering the gills) can be found at the edge (margin). The stem, which is often curved, share a similar yellow-brown colour (sometimes greenish) though dirty brown towards the base with a fibrous appearance. The gills , when younger, appear green-yellow which act as a good indicator in identification.

They almost look good enough to eat (and do have that ‘mushroomy’ smell), but unfortunately are not edible and will most likely give you stomach ache, vomiting and similar gastrointestinal symptoms. But the almost identical Conifer Tuft (Hypholoma capnodes) on the other hand – is edible – but less common throughout the year. As the name suggests, this species only grows in coniferous woods, in fact only always found on rotting tree stumps.

There is a ‘taste test’ you can make to identify between the two. Simply taste a small sample from the cap, making sure you don’t swallow! If it is bitter in taste, it is a Sulphur Tuft but if it is mild, then it is a Conifer Tuft.

Please note that you shouldn’t try this taste test with other mushrooms or toadstools you find (unless you know exactly what you’re dealing with. ie. Russula or Lactarius) as nasty results can come from tasting unknown species!

And if you do find some Conifer Tuft, I’ve heard they’re best steamed or used in a soup. I have no idea what they taste like!

Sulphur Tuft (Hypholoma fasiculare). Note the slight yellow green of the gills which age to an olive colour, and then finally to dark brown.

Sulphur Tuft – Grouped clusters on a fallen log and a group of young/small specimens.

The Genus HYPHOLOMA (Brownies): Characteristics to look out for:

• Often yellow/orangy brown caps.
• Dark brown spore print.

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