Resupinatus "trichotis-IN01"
Comment here from user cooperj in 2018 stating it will one day be called Resupinatus novaezelandiae (observation is New Zealand; edit 3/2/25 this has since been rescinded):
https://www.inaturalist.org/observations/10479709
additional comments related to this discussion can be found on this observation:
https://www.inaturalist.org/observations/190275824
Substrate info:
Growing on a rotting willow log beside the river.
https://www.inaturalist.org/observations/10479709
"On a fallen hardwood twig"
https://www.inaturalist.org/observations/83875517
"Growing on thick, larvae-ridden vine" Possibly Vitis sp?
https://www.inaturalist.org/observations/118275743
Growing on dead wisteria vine or dead Chinese privet
https://www.inaturalist.org/observations/34720403
Growing from dead for 5 years tulip poplar.
https://www.inaturalist.org/observations/39114228
Hardwood
https://www.inaturalist.org/observations/145214413
Mycelium on agar:
https://www.inaturalist.org/observations/150149356
Microscopy:
Possibly cap hairs, cystidia, and spores
https://www.inaturalist.org/observations/172516146
metuloid cystidia
Spores:
4.3-5.0 x 2.9-3.4µm
Me 4.6 x 3.2µm
Q 1.3-1.6
Me Q 1.5
N=11
https://www.inaturalist.org/observations/190275824
notable features
Margin 'scalloped' with age
https://www.inaturalist.org/observations/145827968
macro photos of cystidia(?) on gills
https://www.inaturalist.org/observations/190275824
macro photos of cystidia(?) on gills
https://www.inaturalist.org/observations/83875517
Young cap hair
https://www.inaturalist.org/observations/83875517
mature cap hair with lots of hair
https://www.inaturalist.org/observations/10479709
Pendulum growth
https://www.inaturalist.org/observations/39114228
Pleurotoid growth
https://www.inaturalist.org/observations/91902558
two tone color
https://www.inaturalist.org/observations/141829916
two tone color receding hair
https://www.inaturalist.org/observations/178391817
well mature
https://www.inaturalist.org/observations/188591475
pins pictured:
https://www.inaturalist.org/observations/134254748
https://www.inaturalist.org/observations/98749806
https://www.inaturalist.org/observations/83875517
Size reference:
25mm across
https://www.inaturalist.org/observations/10479709
Largest cap was approximately 1-1.5cm in diameter
https://www.inaturalist.org/observations/34720403
https://www.inaturalist.org/observations/178391817
With a United States quarter coin (24.26mm wide) for reference indicating some caps may be approximately as wide as 12-14mm
https://www.inaturalist.org/observations/118275743
Photo showing fresh fruiting bodies about 0.5cm wide
https://www.inaturalist.org/observations/39114228
Photo showing about 0.5cm wide caps
https://www.inaturalist.org/observations/57471425
rough measurements appear to be a little more or less than 1cm wide each
https://www.inaturalist.org/observations/129942182
Largest cap a little over half the width of a US Quarter which is 24.26mm wide (perhaps ~15mm) with others maybe approximately 7-9mm wide.
https://www.inaturalist.org/observations/141829916
<0.5 cm
https://www.inaturalist.org/observations/178087572
Highest RiC ITS sequence:
489
https://www.inaturalist.org/observations/98749806
Seasonality:
So far this has been collected every month of the year except April, July, and December. I would assume that given the distribution being North America and New Zealand currently that this species can occur in any given month of the year. The one Month that it was reported in New Zealand was March. It is reported more frequently June-November with a peak in August.
Mycomap overview page:
https://mycomap.com/taxonomy/539782-resupinatus-trichotis-in01/
In summary:
Growing few to many on hardwood debris, Willow (Salix), unknown vines (perhaps Vitis sp), Wisteria or Chinese Privet (Ligustrum sinense), or Tulip Poplar (Liriodendron tulipifera). Size of host ranging from "twig", to branch, or appearing to be on "logs". Caps ranging from 5mm to 25mm wide. Cap colors ranging from grayish white, two tone whitish and gray, grayish brown, and dark brownish gray. Growing like a pendulum/cupulate when resupinate, pleurotoid, kidney (reniform), or fan shaped (flabelliform). Hairs on the cap are notable at the point of attachment and sometimes reaching as far as 1/2-3/4 of the cap from the point of attachment to the margin. Hairs ranging from grayish in color when young to black at maturity. cap margin sometimes becoming scalloped in age. Metuloid cystidia present and visible at times with a macro lens. Spores: 4.3-5.0 x 2.9-3.4µm with a Mean of 4.6 x 3.2µm Q 1.3-1.6 with a Mean Q of1.5 N=11. Spores shaped ellipsoid to ovate to perhaps subglobose, but definitely not globose. Likely growing year-round with the peak season appearing to be August. Distribution perhaps cosmopolitan with sequences from North America and New Zealand. [1]