Image #1:
Canon EOS 6D + Canon MP-E 65mm f/2.8 1-5x + Yongnuo YN-14EX TTL LED Macro Ring Flash
1/180 sec, f/9.0, ISO 100
Color Corrected w/ X-Rite ColorChecker Passport

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Additional notes for sequences (bases on the right):

ITS:

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Originally posted to Mushroom Observer on Apr. 27, 2018.

Coprinellus 'PNW 04' growing completely submerged in flowing water on various small pieces of wood. I have no reason to think the water level here has recently risen, in a spring and summer long stream of snowmelt directly below a culvert in a considerable current, we haven't had any significant hot streak that would have raised the flow.

Overmature and mature clusters collected. Bases of the stipe seemed to have a "holdfast" adaptation at the base similar Vibrissea, see pictures. (I know they are in a different order, more of a visual metaphor)

Aka Yellow Patches - this specimen is about 2 1/4 inches high and has a prominent ring left by the partial veil and what looks like damage to the stipe making it look sort of like Big Bird's legs. This is a 21-image stack and features a cute little bug on top and a tiny mushroom hiding in the moss.

Sporen zylindrisch bis phaseoliform
(4.9) 5 - 6.2 (6.5) × (2.6) 2.8 - 3.28 (3.3) µm
Q = (1.7) 1.73 - 2.1 ; N = 13
Me = 5.7 × 3 µm ; Qe = 1.9
Lamellentrama mit Kristallen
Ohne Schnallen
Basidien 4-Sporig häufig verbogen/wellig
HDS eine Kutis aus kurzseptierten Hyphen mit Intrazellulärem Pigment

Finally! After all these years, I am able to see this peculiar species!

Found growing on wet, rotten, wood of Populus tremuloides

synnemata, isolate, +- indeterminate, white, with transluscent stipe. Clamp connection at some septa. Conidiogenesis not observed. Conidia, hyaline, flat, formed with four symmetrical lobes, giving it the appearance of a Four-leaf clover or a poppy flower. Conidia probably attached flat on the top of the conidiophore. Conidia measure 9 - 12µm in length. and about 4-6µm in height.

Conidia, rarely, with 5 lobes, perhaps finding one is a sign of good luck

The distinctive conidia, synnematous conidiomata and clamps connection make this species unique

Growing on Carya nuts and bits of hardwood sticks among hardwood leaf litter near Quercus spp., Carya sp., Ostrya virginiana and Viburnum sp. Gills short-decurrent, with serrated margins; becoming dull brown in age. Stems with strigose, white basal mycelium. Context white.

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Originally posted to Mushroom Observer on Oct. 2, 2022.

Growing on bark on the underisde of an unidentified hardwood stick near Platanus occidentalis, Acer negundo, Acer sacchariferm, Ulmus sp., Salix nigra, Fraxinus sp., Rhamnus cathartica, Lonicera maacki, and Campsis radicans. Co-occuring with Hemimycena s.l. DG2307099. Pileus whitish at first. Basidiocarps up to 8.2 mm wide. Lamellae often exceeding cap margins. Odor not distinctive. Not bioluminescent. Clamps present in the lamellar trama. Cheilocystidia hyaline; smooth; thin-walled; clavate, ventricose, cylindrical, utriform, or ovoid; some with flexuouse apices. Basidia 4-sterigmate. Spores brown, punctate, and thick-walled. Spore measurements: (5.4) 5.8 – 6.7 (7.1) × (5) 5.2 – 6 (6.4) µm; Q = (1) 1.1 – 1.17 (1.2); N = 30; Me = 6.3 × 5.6 µm; Qe = 1.1

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Additional notes for sequences (bases on the right):

ITS:

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Originally posted to Mushroom Observer on Oct. 6, 2023.