From Kauffman 1925 (note this is an American author describing American collections using a European name):
Gomphidius glutinosus Fr. (Plate 12).—There are good specimens from Bresadola at the New York Botanical Garden, and typical plants from Sweden in the Atkinson Herbarium. The principal point to be brought out here is that the cystidia are not abundant. In fact in some mounts it is difficult to locate them. In overmature and dried plants they are frequently shriveled, so that observations must be carefully checked. The cystidia of this species also appear to be less cylindrical than in many of the others. The caps are usually quite large, and the stems stout and long. It may be said to be the largest species.
I have not yet found any formal European descriptions online. However, this is from Moser’s 1978 “Keys to Agarics and Boleti” (translated by Phillips in 1983):
Lamellae not changing where pressed. Young a long time covered by viscid veil. Cap grey- to chocolate brown, sometimes also violaceous-grey, 5-10 cm and more. Stipe white, then dirty grey, brownish, base yellow, tapering (Fig. 5). Spores elliptical, long, 18-22/5-7.5 µm. Mycorrhizal with coniferous wood.