Hallo Sepp,
ich hatte inbrünstig gehofft, jemand möge die Art sogleich erkennen. War nix.
Ich kopiere hier mal SMITH´s Beschreibung von P. barlae (nach K.v.WAVEREN zu P. bipellis gehörig) ein:

62. Psathyrella barlae (Bresadola) A. H. Smith, Contr. Univ. Mich. Herb. 5: 39.
1941.
Psathyra barlae Bresadola, Fungi Trid. 1: 84. t. 91. 1887.
f. barlae
Illust. Bresadola, op. cit., t. 91; Smith, op. cit. pis. 16, 30, figs. 3, 4, 6. Pl. 75, fig. a;
Text Figs. 157-159.
Pileus 3-5 cm broad, obtusely conic when young, becoming plane or with a
low broad umbo, surface glabrous on the disc and with a narrow fringe of
whitish fibrils along the margin when young, glabrescent, color "warm blackish
brown" to "dark livid brown" when young (deep vinaceous red), the disc soon
"pale grayish vinaceous" to "russet-vinaceous" (paler vinaceous-red), hygrophanous, striate when moist, disc near "cinnamon-buff" when faded (pale tan),
atomate when faded and becoming somewhat rugulose. Context thin, firm, brittle,
concolorous with the surface when either moist or faded, odor and taste mild.
Lamellae bluntly adnate, soon seceding, close to subdistant, about 3 tiers of
lamellulae, moderately broad (4-5 mm), "russet-vinaceous" when young (medium
vinaceous-red), tinged chocolate-gray in age, pruinose under a lens from the
pleurocystidia, edges even.
Stipe 5-10 cm long, 4-6 mm thick, equal, hollow, fragile, "pale vinaceousfawn" to "light vinaceous-fawn" beneath a coating of appressed white fibrils,
appearing longitudinally fibrous-striate and canescent, becoming sordid in age.
Spores 12-15 x 6-8,u, smooth, with a distinct often oblique apical pore, shape
in face view elliptic to nearly oblong, in profile subelliptic to very obscurely
inequilateral, color in KOH dark bister and slowly darkening to dark coffeecolor, very dark vinaceous-brown under the microscope when fresh, in Melzer's
bay-red, wall about 0.4 t thick.
Basidia 4-spored, (20-)26-38x 10-15 u, hyaline in KOH, clavate-pedicellate.
Pleurocystidia abundant, 60-90 x 10-16 A, subutriform to fusoid-ventricose with
rounded to obtuse apex, at times subcylindric, the wall thin, smooth and hyaline
(or rarely some debris adhering near the apex), content not distinctive in either
KOH or Melzer's. Cheilocystidia similar in shape to pleurocystidia but usually
smaller. Caulocystidia not located. Cortex of stipe of hyphae with fuscous brown
wall thickenings (or incrustations) near the septa (as revived in KOH).
Pileus with a cuticle of vesiculose cells having thin, smooth, hyaline walls
and lacking a distinctive content in either KOH or Melzer's as revived, some
clavate to pyriform cells intermingled in the layer. Context of hyphae with
grayish brown to fuscous-brown deposits of pigment or wall thickenings particularly near the septa but also incrusting the hyphae as zones or bands, cell content
not distinctive in either KOH or Melzer's as revived. Clamps present.
Type locality. Europe.
Habit and habitat. Gregarious to cespitose on soil and humus.
Distribution. Washington.
Observations. Malenqon and Romagnesi (1953) illustrated the cystidia of
both P. barlae and P. bipellis Quel. Those of the latter species would place it in
a different section in my classification. Since I have found a difference of the
type these authors illustrated, to be, on the whole, a very constant feature in
North American Psathyrellae, I continue to recognize P. barlae as a distinct
species, but now recognize the collections from the Great Lakes region previously
referred to as P. bipellis as forma minor of P. barlae. This species and its variants
are intermediate in veil features and have also been keyed out in subg. Psathyrella
to facilitate identification.
Material examined. Washington: Smith 14247, 14326, 14525, 14811, 14849.

Soweit ich das verstehe, müssen die Zystiden nicht auffällig getropft bzw. mit Anlagerungen behaftet sein. Vielleicht hast du doch P. bipellis gefunden?
Beste Grüße! Andreas