I can’t believe it’s not Butter! The Butter Cap

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Sorry for the awful title, but it had to be done! I can’t believe I haven’t made a post on this mushroom before either. Next to the Brown Roll Rim, this has had to have been the most common mushroom I’ve found in great number during autumn/early winter last year (2011).

Collybia butyraceaOften found in woodland in large scattered groups or even as solitary souls, the Butter Cap (Collybia butyracea / Rhodocollybia butyracea*) is a very common edible mushroom (hence being categorised in my ‘Woodland Treats’ blog category) but does not have a particularly pleasurable texture or amazing taste (so I’ve put it in ‘Tales of Toadstools / The Inedibles’ category too).

The texture of the cap, as the common English name suggests, is very smooth, slippery and greasy – not unlike the sensation when you run your finger on some butter… As you do!

To my now ‘trained eye’ they are instantly recognisable. But as you’ll find with experience, the appearance, specifically the cap, can be a very unreliable visual marker for identification due to colour variations. These variations can also be exaggerated due to moisture level and age etc…

The unreliable cap colour can range from dark red/brown, ocherous/buff brown to pale bone-white or ivory (usually with a much darker centre) when older and dryer. Also adding to the confusion is that this species has a common ‘lighter’ variation (Collybia butyracea var. asema) which (I think) is currently under debate. It is generally lighter all round in colour, and I’m making an educated guess that the centre picture below is a good example of this variant.

The shape of the cap and the gills are fortunately more reliable, usually with a shallow dome shape and distinctive raised bump at the centre (or umbo). Sizes in width can differ from small to medium-large (3 – 8cm) and the margin (edge) is lighter than the rest of the cap, sometimes becoming irregular and even ‘wavy’, often showing a faint striated edge (see Mushroom Identifaction Page for more info on Margin/Edge ID features). The gills are crowded, free from the stem and remain white(ish).

But for best identification I always examine the stem. It shares the same brown shade shown on the cap and typically has a slightly thicker base compared to the thin tapering at the apex where it joins the cap. It becomes hollow towards the base which is darker, often covered in fine white down. A little test to confirm identification is to break apart the stem. It is very tough and stringy and you will see also where it is hollow at the base.

You can take a quick ‘smell’ test, but again, I wouldn’t fully rely on this for a good ID tip. It can be very mildly mushroomy or even slighty rancid. So there you go!

Note: As I mentioned earlier, this species is abundant in mixed Woodland throughout autumn to early winter, but while out on a recent foray that they can appear in grassland near woodland, but it doesn’t happen often. The small group I found in November 2011 were of the lighter variety, large and creakily shaped. Obviously they were going mad trying to get themselves back to the woods. Maybe!

*Note: To date, some members of the Collybia family have been moved to new genera due to DNA research and some may have different names. ‘Collybia butyracea’ still seems to be currently used here and there, but technically speaking it is ‘Rhodocollybia butyracea’.

Collybia butyracea - var.asema

Butter Caps (Collybia butyracea var.asema) abundant in leaf litter in autumn through to early winter. Note the ‘broken apart’ stem base which is covered in fine white down (bottom-left). It is stringy, tough and hollow.

QUICK ID TABLE: BUTTER CAP Collybia butyracea / Rhodocollybia butyracea

CAP / FLESH

3-7cm accross. Initially convex; flattening out, developing distinctive central bump (umbo). pale ochre – reddish brown (dependent on what variety). Drying to reveal patches of ivory white. White flesh with mushroom smell. Greasy (buttery) to touch.

STEM

2.5-5cm x 0.5-1cm. Tough. Slightly bulbous at base. Similar colouring to cap. Becoming hollow. Base when broken is stringy and fibrous.

GILLS / SPORE PRINT

Free, crowded and whitish.
Spore Print: White or very pale pink (see how to take a spore print here).

HABITAT / SEASON

Leaf litter in deciduous or coniferous woods. Autumn – early winter.

EDIBILITY

Edible but not great.

The Genus COLLYBIA (Toughshanks); RHODOCOLLYBIA taxonomy for this species: Characteristics to look out for:

• Tough, fibrous/flexible stems.
• No ring or volva present.
• Gills often crowded / never decurrent.

ExCEPtional! – The Penny Bun, Cep or Porcini mushroom

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The Bolete genus (and those closely related) are some of the largest and most exciting mushrooms to be found out there. From a culinary point of view there are several that are more than worth the their place in the kitchen, but there is one in particular that stands out as ‘best of the rest’.

Boletus edulisSo let’s get it’s name sorted out. Most people will definitely recognise common/local names, a couple of which are not English in origin. Our common tongue has described this as the ‘Penny Bun’ for obvious reasons (although probably not to todays generation), many also know it as the Cep (French) but then most cooks and chefs will often know it from it’s Italian translation as the ‘Porcini mushroom’. But at the end of the day, science has kept things in order, strictly labeling it as Boletus edulis – the latin name ‘edulis’ simply meaning ‘edible’. Very apt, as usual.

Excluding Truffles, the Cep (as I’ll call it from now on) is one of the most highly prized edible finds, especially in mainland Europe. Some foragers only have this one mushroom on their list, such is their passion for it.

It is a very distinctive looking mushroom with it’s stout, chunky stem and small ‘out of proportion’ cap (common to younger examples – shown opposite). They can sometimes pop up in abundance or smaller groups, but are often solitary near/under broad-leaved and coniferous trees.

The picking season can be as early as June or July, but often show up from August to September. With this year’s season being mostly dry, only November has been reliable in dishing out the goods – for me this year anyway!

Young specimens are usually favoured over older specimens (often maggot-ridden) and will be cooked or pickled whole, or even dried for later consumption. They freeze extremely well too.

The pores in older ‘middle-aged’ specimens change from white to a dull yellow-green colour (as the spores are olive green/brown). The tubes are usually removed and the cap is thinly sliced along with the stem (peeled first) to add to the pan. Overall, it’s good to know there are many ways to store, cook and eat this mushroom. I’m no top chef , but there’s lots of ideas out there. A great selection of recipes with the cep mushroom can be found on the BBC website here.

There are a couple of edible ‘look-a-likes’ often confused with the Cep, such as the The Dark Cep (Boletus aereus) and maybe the Bay Bolete (Boletus badius). But beware the Bitter Bolete (Tylopilus felleus) with a dark network on its stem. Although not posionous, it’s a recipe for disaster when served up at dinner time. As the name suggests it has a very bitter, unpleasant taste.

So a useful feature to note in identifying the Cep is looking for the raised ‘white’ network/pattern on the stem (reticulation) as shown in the picture below. None of those mentioned above share this feature.

Good hunting…

The Cep

What a difference! A large middle aged/mature specimen next to a younger example. Notice the ‘white’ raised network on the stem and how the pores age ‘yellow/green’ compared to the paler white colour of younger ones.

Boletus edulis Mushroom UK

A young, perfectly from Cep mushroom discovered in Leicestershire UK – open grassland near woodland.

QUICK ID TABLE: CEP Boletus edulis

CAP / FLESH

8-25cm across. Brown. White line at margin of cap. Smooth and dry becoming greasy. Viscid in wet weather. Flesh is white (flushed dingy yellow or vinaceous in the cap).

STEM

3-23cm x 3-8cm. Often swollen at base. Pale with white network covering the stem.

PORES / TUBES / SPORE PRINT

Pores are small and round, initially white; ageing yellow, then greenish-yellow. Tubes are white, becoming grey-yellow.
Spore Print: Olivaceous walnut-brown (see how to take a spore print here).

HABITAT / SEASON

In coniferous, broadleaved or mixed woods. Summer – late autumn.

EDIBILITY

Edible. Excellent.

The Genus BOLETUS (the Boletes): Characteristics to look out for:

• Have pores (open ends of tubes) on the underside instead of gills. Easily separated from the cap.
• Most have dry caps (viscid when wet – but not glutinous like Suillus genus).
• Most have reticulation on the stem; a fine network covering parts or all of the stem. Make note of the colour.
• When cut or bruised take note of any changes in colour to the flesh or pores.

Halloween Special – The Witch’s Hat

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This mushroom is one of, if not ‘the‘ most common of all the Waxcaps (known as the Hygrocybes) which I recently discovered on the 30th October. By posting on the first day of November I realise I’ve missed the Halloween deadline (excuse the pun) and I’m sorry. But Halloween ‘is’ the eve of ‘All Saints Day’ – making my error simply forgiven! Or something like that…

Hygrocybe conicaAlthough it has been a relatively bad season for mushrooms and fungi alike due to the dry weather, this last week has proved fruitful, especially in relation to Waxcaps.

Because of the excellent timing, I had to feature the ‘Witch’s Hat’ or ‘Blackening Waxcap’ (Hygrocybe conica) to be my latest post.

As the common and scientific name suggests, the cap of this very common grassland mushroom is ‘conical’ in shape, usually broadly conical or bell-shaped (often irregularly lobed). The texture, common with all Waxcaps, is slimy and waxy and although quite small, is very noticeable in the grass due to it’s bright and striking colours. In this case, the colour can vary somewhat, but mainly you can see yellow/orange (sometimes with scarlet shades) – even hints of green can be present.

But the main feature you will recognise (again, shared with some other Waxcaps), is the ‘blackening’ effect (sounds very seasonal and horrific!). The older the mushroom is – the blacker it will get – although it does not auto-digest and turn to ink like the gills of the Inkcap genus.

Very old specimens turn completely black and appear to be decayed or burnt out. If picked, you will also notice it will bruise black upon handling. But if left alone, the blackening process will slowly take effect, starting mainly from the cap edge (see image above).

Keep a look out this (late) autumn and you may find some along with it’s more colourful friends. It can be found mainly in grassland in fields and woods, but is also common in ornamental lawns, waysides and even plant pots (as my mother discovered!) due to it being less sensitive to nitrogen enriched soil.

It is classed as edible and sometimes as inedible or poisonous from different references. But it is not deadly, and I’m guessing – not very palatable. It’s just best for looking at, which is good because it’s so good looking…

Witches hat

Very common Waxcap, found in field or woodland grass. Bright orange/yellow (sometimes with red or green hues) that blackens with age (see far left).

QUICK ID TABLE: BLACKENING WAXCAP / WITCH’S HAT Hygrocybe conica

CAP / FLESH

3-5.5cm accross. Conical or bell-shaped. Often irregularly lobed. Waxy. Yellow/ Orange colours. Blackens with age.

STEM

3-7 x 0.6-1 cm. Yellow, scarlet flush. Blackening streaks with age.

GILLS / SPORE PRINT

Adnexed or free. Pale yellow. Waxy.
Spore Print: White (see how to take a spore print here).

HABITAT / SEASON

Grass in fields or woods. Ornate gardens and plant pots too. Autumn.

EDIBILITY

Edible,but best avoided.

The Genus HYGROCYBE (Waxcaps): Characteristics to look out for:

• Small sized caps brightly coloured in reds, yellows, oranges, greens and whites.
• Caps are often conical or domed and normally greasy or slimy.
• Gills are waxy. Some bruise blackish when damaged.

See Kew gardens conservation news on the British Waxcap family here.