P. lutescens seems to fit very well. It may also be that P. epiphyllum differs from P. lutescens in isodiametric cells on the flanks and having only prismatica towards margin.

P. lutescens grows on undecayed coniferous substrate, unlike P. epiphyllum.

My key goes after the carotenoids, but that might be a bit questionable, see the specific epithet. Also the oil content is perhaps more variable than stated there:

100. Ap. with carotenoid-LBs, Hym. yellowish to ochre .... 101 -> epiphyllus

Sp. 14-22/3,5-6 µm, oil content 4-4,5

100. Ap. without carotenoid-LBs, Hym. ±whitish .......... 105 -> lutescens

Sp. 11-20/3,5-4,5 µm, oil content 1-3,5

My impression was that the substrate is little decayed, but I might be wrong.

Declercq's key has the two in a couple:

13 Apothecia scutellate, disk yellow, reddening, shortly stalked. Asci (dead) 85-90x7-7,5 µm. Spores slightly shoe-shaped, (dead) 12-15x3,5-4 µm, OCI=3-4. On cones of Pinus sylvestris. Phen.: VII-IX.
----------- Phaeohelotium lutescens (Hedw.: Fr.) Declercq comb. nov. ined.

13' Apothecia turbinate with concave to plano-convex disk, fleshy, 0,5-3(7) mm diameter, pale yellowish to yellow, reddening when damaged, subsessile to shortly stipitate. Asci 90-135x9-11 µm. Spores assymetrical fusiform, inequilateral, 0(1)-septate, (9)11-20(24)x(3)4-5,5 µm, with 1(2) up to 3 µm diameter guttules and many small ones at each side, OCI = 4-4,5, becoming 2(?3)-septate and pale greyish brown when overmature. Paraphyses, subhymenium and excipulum with strongly refractive guttules. On plant debris, such as cones and needles of Pinus, catkins of Betula, cupules of Quercus and Fagus, but mainly on leaf litter of Quercus. Phen.: (VIII)IX-XI.
------------------- Phaeohelotium epiphyllum