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Tree loving – The Poplar Fieldcap

To be honest, I don’t really see many Fieldcaps, scientifically known as Agrocybes (Agro meaning Field and cybe meaning cap/head). Many have a fruiting season from late spring through to autumn, hence they are very conspicuous when seen during the summer months, when there is little about. And to add as an update/note (May 2017): This species is now classified as Cyclocybe cylindracea)

Agrocybe speciesThis is my second find in the same month of two different species of Agrocybe, but I’ll focus on the latter example here. Although its common name suggests its habitat, the Poplar Fieldcap (Agrocybe cylindracea or Cyclocybe cylindracea) only grows in association with trees, namely Poplar and Willow – just like our native Black Poplar as in this case. (More info on identifying the Black Poplar here). It’s really not that common but has an ‘all year round’ season, and rather than being seen with trees, it can also be found out of its natural surroundings such as on rotting wood mulch and garden chippings.

I found this small collective at a local park that seemed to be growing in the grass, near a Poplar tree. As I always say, check out the environment, because at first glance some things can be deceptive. On closer inspection, the stem bases were actually attached to the gnarly roots just hiding beneath the grass, embedded slightly deeper in the soil. This fact alone helped as a great clue to its identity.

I caught them a little late though. When younger (as you will see in some of the pictures below) the whitish/pale buff caps are rounded and smooth and range from 4cm to 6cm across. After a short time the caps expand (up to 10cm approximately) and often dry out to leave a ‘crazed’ surface pattern and the margin often becomes wavy and split. Initially the adnate (or slightly decurrent) gills are pale but soon mature to dark tobacco-brown as the spores mature. These mature spores will fall onto the persistent ring beneath, leaving a dirty brown stain on the upper side.

Although edible I don’t hear much about what people think about them. I simply assumed they were just not held in any high regard. But after sampling a couple of the younger, more fleshy samples, I was pleasantly surprised. The smell and taste is typically ‘mushroomy’ but much milder with a ‘nutty’ hint. Very nice indeed. I would definitely recommend them.

So, for a species that isn’t terribly common I was lucky to find these… Well, actually I was told about them by a friend. It’s pays off when you ask all your friends and family to keep a look out. All those extra pairs of eyes are very useful. Happy hunting.

Polar Fieldcap images

Top: Notice the spores that have dropped onto one of the younger caps, leaving a dark brown stain. A.cylindracea often grow in tight overlapping groups. The cap flattens out with age and splits at the margin. As it loses moisture and dries out, it develops a ‘crazed’ surface pattern.

QUICK ID TABLE: POPLAR FIELDCAP Agrocybe cylindracea / Cyclocybe cylindracea

CAP / FLESH

4-10cm across. Pale. Whitish with yellow-brown centre. Darker with age or brown from spore deposits of other mushrooms. Rounded at first, maturing flat and often cracking.

STEM

5-10cm x 1-1.5cm. Creamy white. Darkening with age. Persistent ring often coloured brown on the upper side by falling spores.

GILLS / SPORE PRINT

Adnate or slightly decurrent. Initially cream, maturing to tobacco brown colour.
Spore Print: Tobacco brown (see how to take a spore print here).

HABITAT / SEASON

In groups, sometimes overlapping, growing with Poplar and Willow. All year.

EDIBILITY

Edible. Mild and slightly nutty flavour.

Poplar Fieldcap Sketch

Cracking up! – Iodene Bolete

Sometimes the best wild mushroom finds are the ones when you’re not actually looking for them. These mushrooms were only a few hundred yards from my home on a grass verge beneath an Oak tree.

Growing Iodine BoleteMy chance discovery was an Iodene Bolete (Hemileccinum impolitum – formerly. Boletus impolitus) which mainly shows up in the Summer. It isn’t really that common either. Its appearance can be infrequent or rare.

It favours broad leaf trees, especially Oak, which in this case it preferred. There were several of them in a small group, standing out like sore thumbs. I had passed them earlier in the month, while out on my bike, as their caps were poking through the growing grass. I had only glanced over at them initially. To be honest they looked just like discarded old potatoes thrown on the verge, so I ignored them. How stupid did I feel realising later my mistake!? And who throws potatoes onto a grass verge anyway?

There is no staining on this mushroom when cut or bruised, which helped me identify it. Several books I looked at had shown the cap with no cracking on top exposing the yellow flesh within. But, to be fair, it was mentioned within the text.

The bugs absolutely loved these shrooms – they were all over them. So after I had flicked and shook them all off I took one for myself. Knowing this was an edible Bolete I thought I might give it a taste test (not expecting a taste sensation though!). But unfortunately after slicing in half, the base of the stem was already home to many small white maggots living it up in the mushy mess they had created. Oh well!

The council grass mower soon trundled across the verge, so I couldn’t grab myself another! Unfortunately.

Ioden Bolete

Iodine Bolete with olive-brown cracking cap

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.