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As with plants, different species of fungi can grow in close proximity so you cannot assume that all mushrooms produced in a particular area are the same. With these two species, as you brought back samples they could quickly have been distinguished by taking a spore print.
Ken
The ones with the white gills are a white spored species, in this case Leucoagaricus leucothites. Ken
I often have problems trying to pin down colours on my laptop screen or on my phone so I won’t argue the point strongly since we only have photos to go on. But just a comment that Lepista luscina/panaeolus can have pinkish or pinkish grey tones in the gills, and I wouldn’t be able to distinguish between lilaceous tints or pinkish-grey from the photo. The smell is, though, a significant character so you’d need to be sure you were categorising the smell correctly to narrow down the options.
Ken
If the smell was noticeably farinaceous I don’t think this is Lepista nuda. I think it is more likely to be one of the species in the complex around Lepista luscina/panaeolus. Flora Agaricina Neerlandica describes L. rickenii as a species with a brown hygrophanous cap, farinaceous smell and growing in rings in slightly calcareous grassland. But Funga Nordica doesn’t retain this as a separate species.
You would need to look at the spores to take it further, but even then you might not get very far because of the lack of clarity in the literature.
Ken
Yes, I agree this is undoubtedly Gymnopus peronatus. Sometimes the internal spore contents can give a false impression of roughness on the surface when racking up and down.
From the British Checklist: ‘Habitat: Solitary or gregarious on decayed leaf litter of deciduous trees, and occasionally in conifer litter.’
Ken
I think it will be Hebeloma sp. with a pruinose stem. Not possible to identify to species without lots of microscopy. 🙄 Ken
Here’s a link that may or may not help: http://www.lichens.lastdragon.org/Lichenomphalia_umbellifera.html ” class=”bbcode_url”> http://www.lichens.lastdragon.org/Lichenomphalia_umbellifera.html and here’s the link to the British Checklist information, which includes ‘Habitat: On acidic soil or peat in heathland and moorland, with the anamorphic lichen state. Also known with mosses, including Sphagnum spp., and on decayed wood, usually old stumps’.
http://www.basidiochecklist.info/DisplayResults.asp?intGBNum=42373 ” class=”bbcode_url”> http://www.basidiochecklist.info/DisplayResults.asp?intGBNum=42373 Worth a check, I think, given the habitat.
Ken
Hi Leif Did you rule out Lichenomphalia umbellifera?
Spore shape looks about right. According to Funga Nordica and other sources it can grow on decayed wood.
Ken
Your description of the spore print leaves me with a puzzle. It does look dark brown, though it is a little bit thin. To get the true colour you have to scrape the spores into a heap and allow them to dry out, but you can’t readily do this with a spore print on paper. Cortinarius spore deposits should be reddish-brown. If I hadn’t seen your spore print, I would have said you have Cortinarius trivialis, based on the glutinous remains on the stem and the slimy cap (which together put it in subgenus Myxacium), and the remains of a cortinal ring zone on the stem.
It would be interesting to see if anyone has any other thoughts.
Ken
Looking now on a laptop screen rather than my phone, I think the characters don’t fit well with my earlier suggestion of H. radicosum. 🙄 As Leif suggests, the lack of clear characters leaves things wide open e.g. the browning of the lower part of the stem and maybe a hint of banding could even suggest Cortinarius trivialis (but that’s just another wild stab in the darkKen
I have seen both of the white species this year – Tricholoma album and Tricholoma stiparophyllum… or at least I believe so, because they are very tricky to distinguish. Ken
… and it would avoid a lot of discussion up blind alleys if we had spore colour up front, as I know to my cost only too well. 
Ken
There isn’t really enough information in the photos to see the relevant characters. In case it helps to see if it fits, here is the description of Hebeloma radicosum from Fungi of Northern Europe 3. ‘Medium sized to large with a conspicuously rooting stem and a strongly developed universal veil forming a membranous ring and mostly with a smell like marzipan.
DESCRIPTION: Cap 25-110 mm, hemispherical, then expanded, with or without a low, broad umbo, margin decurved, with a thick slime-layer, often with appressed, sordid whitish to brownish grey scales, not hygrophanous, pale cream to cream or warm buff, towards the centre sometimes dark pinkish buff to ochraceous, sometimes with claybuff to umber spots. Gills emarginate, broad, crowded, dark greyish buff to clay-buff, edge concolorous or slightly paler, but not distinctly whitish-fimbriate, without droplets. Stem 35-120 x 8-15 mm, cylindrical or widened in the basal part, with a distinct, spindle-shaped, rooting base, with a membranous ring, above the ring pruinose to flocculose, under the ring floccose, at first whitish to pale cream, gradually turning claybuff to greyish brown or umber from the base. Flesh solid or partly hollow or stuffed in the stem, white or whitish, in the outer part of the stem discolouring through clay-buff to greyish brown from the base. Cortina absent; universal veil very strongly developed (forming the membraneous ring and cap scales). Smell distinct to strong, marzipan-like, occasionally almost inodorous in young specimens. Taste mild to bitter.
ECOLOGY AND DISTRIBUTION: In deciduous forests on rich or fairly rich soil, especially under Fagus, but also with Carpinus, Quercus and probably Tilia, Betula and Corylus. It is favoured by the presence of nitrogen compounds, like for instance in vole nests.’
Ken
