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The following description is of the two specimens of collection MHCB-17081802. I have found specimens larger and smaller than the specimens collected, also several specimens with a much more pronounced cap texture and colour than these. Unfortunately didn’t have the time to add that data to the description. I may add the photos as seperate observations, since they were found on other days. Pileus: 35-42 × 11-14 mm; convex with low, yet distinct umbo, appendiculate margin when fresh; centre smooth or with small, fine, appressed, areolate scales, from centre towards margin radially superficially fibrillose or seemingly lacerate or with fine scales; grey-brown with reddish or pinkish tinges on paler, eggshell white background. Lamellae: l:3-7, close, very thin; exceeding from stipe, almost like pseudocollarium is present; margins fimbriate; same white as the pileus. Stipe: 52-86 x (3)-5-(8) mm; terete, clavate, often somewhat flexuous; sericeous, longitudinally very finely striate, especially at apex (above annulus), lower third (the part that is in the humus) finely pubescent with white basal tomentum; annulus prominent, flaring up, smooth on top and bottom, straight more or less thick fimbriate margin; white, ever so slightly yellowing after handling. Context: Fairly firm, though soft in the stipe’s base; sericeous on the cut; thin in pileus, hollow in stipe all the way through to the base; white. Smell/Taste: No particular smell; mushroomy odour. Microscopy: *Spores: 8 × 4 µm; quite slender amygdaliform, often with acute apex, thick-walled, no germpore, hyaline. *Basidia: clavate, 4-sterigmate. *Cheilocystidia: fairly uniform clavate, without crystals.
Ecology: Old dune woodland, Fagus sylvatica dominated, with Acer and Quercus, calcareous sandy or loamy soils, thick leaflitter and humus layers; shares habitat with: Melanophyllum haematospermum, Melanophyllum eyrei(Observation 288539, MHCB-17081801), Suillellus luridus (Observation 250762, MHCB-16090201), Limacella cf. vinosorubescens, Mycena filopes, Inocybe sp., Helvella lacunosa, Russula solaris, Russula fellea, Lactarius subdulcis, Lactarius blennius, Gymnopus confluens, Marasmius anomalus, Tricholoma sulphureum, Tricholoma cf. scalpturatum, Hebeloma sp. and much more.
Notes: Finally I have found a better suiting name for this species that has been keeping me up since 2015, when I first found them at this same locality. Initially identified as Leucoagaricus tener, only to find that said species is much smaller and has different ecological preferences. Now with more experience, literature and a working microscope, I can finally tell these are actually Leucoagaricus sublittoralis. Here’s the previous observation of this species: http://mushroomobserver.org/215644?q=8pz... Listed as Currently Not Threatened in our national Red List (Arnolds & Veerkamp, 2008). Distribution in the Netherlands: https://www.verspreidingsatlas.nl/007613... Mushroom Observer: http://mushroomobserver.org/288533?q=8pz...