Thalictrum confine Fernald
ELC337
Plante atteignant 70 cm de haut. Anthères roses. Plante monoïque, à inflorescences unisexuées. Bec de l'akène incurvé, de 2,5 à 3,5 mm de long.

Friche herbacée humide et ensoleillée dans une plaine inondable avec Apios americana, Asclepias syriaca et Solidago gigantea. Sol plutôt sableux, avec une épaisse couche de feuilles mortes déposées là.

Capitulum disk flowers are either creamy or purple, these capitulum consisting of different colored disk flowers appear on the same plant. Involucral bracts have a dark green apical portion. Plant at least 80cm tall

HRL3539

Found in beech forest on well-decayed wood covered with decaying leaves on Sept. 26, 2021. There were about one hundred specimens.

Pileus 11-25 mm
Stipe 62-117 x 1,5-3 µm.
Partial veil cortinoid, evanescent.

Spores 11.2-14 x 6.5-7.8 µm, av. 12.3 x 7.0, Qav. = 1.77, ellipsoid in profile view, long-ovoid in face view, all symetrical, thick-walled (about 1 µm)
Basidia 31-37 x 9-9.5 µm, 4-spored, clamped
Cheilos forming a sterile band, narrowly lageniform, clamped, 29-35 x 6-7, most astipitate.
Pleuros abundant, narrowly lageniform, cylindric-flexuose, clamped, 28-37(-50) x 5.5-8 µm.
Pileipellis an ixocutis

I went through both Guzman's keys and nothing seems to fit. P. quebecensis (= P. aztecorum, apparently) has smaller spores. P. cyanescens has larger and darker pileus, copious veil material and differently shaped pleuros.