Observation 98358: Poronia pileiformis (Berk.) Fr.
When: 2012-06-26
No herbarium specimen
0 Sequences

Species Lists


Aparentemente creciendo en excremento de vaca..
Aparentemente creciendo en excremento de vaca..
Aparentemente creciendo en excremento de vaca..
Aparentemente creciendo en excremento de vaca..
Minute ovalate hyaline spores 1 – 2 microns
The tissue under the cap is cottony solid, no galls or pores.

Proposed Names

7% (2)
Recognized by sight
11% (3)
Recognized by sight
19% (2)
Recognized by sight: no perithecia that I can see; dung is not a substrate for Cordyceps; distinct cap (probably not Xylaria, either), but no details shown for underneath the cap.
58% (7)
Recognized by sight
-6% (2)
Recognized by sight
64% (3)
Recognized by sight: fits description and photo; has tropical range.
17% (4)
Used references: Roz Lowen.
11% (3)
Recognized by sight
28% (1)
Recognized by sight: Doveri keys seven species and the closest match based on spore size is Podosordaria jugoyasan. Google images look OK. Found on rabbit dung in Japan. Another strong lead might be found in the Can. J. Bot. 67: 65-69 because of the close proximity. Krug and Jeng, 1995. A New Coprophilous Species of Podosordardaria from Venezuela.
Used references: Doveri, Francesco. 2004. Fungi Fimicoli Italici: A Guide To The Recognition Of Basidiomycetes And Ascomycetes Living On Faecal Material. Associazione Micological Bresadola, Trento, Italy. 1104p.
Based on microscopic features: Spores 4-5 × 9-11 µm

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
while it has a beautiful etymology,
By: Danny Newman (myxomop)
2017-10-28 21:36:58 CDT (-0400)

I doubt that this is Podosordaria jugoyasan. the max stipe length for that sp. is 2cm. it also grows on hare dung, and was described from Japan.

that said, Eduardo’s reported spore range is not really a good fit for any Poronia species in Fungi Fimicoli, including P. pileiformis, which is exactly what it looks like from a macro perspective. This is the only species I’m aware of which forms hemispherical heads1. That said, I am inclined to suspect a measuring error.

1 Podosordaria australiensis comes close, but Australia + wallaby dung

About Podosordaria
By: Eduardo A. Esquivel Rios (Eduardo27)
2012-07-09 19:01:28 CDT (-0400)

No me parece que sea Podosordaria, ya que la especie de Panama tiene el ascocarpo discoide-plano, y la Podosordaria tiene el ascocarpo globoso, es mas me parece que algunas especimenes clasificados como Podosordaria son Poronia.

By: Eduardo A. Esquivel Rios (Eduardo27)
2012-07-09 07:19:04 CDT (-0400)

Estas ascosporas tienen 6-8 × 10 – 12 Micras aprox.

how big are these spores?
By: Debbie Viess (amanitarita)
2012-07-08 22:47:58 CDT (-0400)

Poronia pileiformis has ascospores 8-11 × 4-5 microns

Also, your early photos of the fruit body are dead ringers for this eyeball only (no micro) IDed Poronia pileiformis. Whatever it is, looks like both of them are it!


ah, switched spores!
By: Debbie Viess (amanitarita)
2012-07-08 22:39:54 CDT (-0400)

yup, these new micrographs look to be a good match on all accounts to Poronia. single celled, dark spores.

you called it Christian, right outta the gate!

By: Eduardo A. Esquivel Rios (Eduardo27)
2012-07-08 22:11:12 CDT (-0400)

Encontre otro especimen de Poronia en estiercol de vaca en la misma area, aunque son mas pequeños y carecen de esclerotia, pero si presentan ascocarpos, ascos y ascosporos tipicos de Xylariaceae.

By: Eduardo A. Esquivel Rios (Eduardo27)
2012-07-08 14:57:51 CDT (-0400)

Pienso que lo que se refiere a las fotos micro , hay un error, se trata de una contaminacion de la muestra, voy a tomar nuevas muestras y hacer nueva observaciones para estar seguro.

the new pictures just went up today…
By: Debbie Viess (amanitarita)
2012-07-07 21:38:02 CDT (-0400)

it didn’t resemble Poronia when it was younger, and the spores are still wrong for that species.

but the spores don’t match Poronia, at least not yet…
By: Debbie Viess (amanitarita)
2012-07-07 20:58:03 CDT (-0400)

from http://mycology.sinica.edu.tw/Xylariaceae/:

“Xylariaceae is one of the most commonly encountered groups of ascomycetes with most of its members being stromatic, peritheciate, with an iodine-positive ascus apical ring, and with one-celled, dark ascospores on which a germination slit can be found. "

These spores do not appear to be dark, they show two cells and I don’t see a germination slit. Was iodine stain used on your slide prep? if so, no amyloid tips to asci, either.

But here’s a quote from one of the Xylariaceae websites that claims some members of this group can show two celled spores before spore maturity

“In the microscope most members of the family (Xylariaceae) can be recognized by having: 1) dark unicelluar spores with more or less evident germination sites, mostly in the form of a slit (pale line). In some cases the immature spores are bicellular and may leave a cellular appendage on the mature spore. Some have gel-coats or appendages; 2) a mostly blue reaction to the apical apparatus of the asci in iodine reagents.”

Maybe a bit more patience will tell the tale? Certainly the macro resembles Poronia to my eye, but…still not a good match on all counts.

By: Eduardo A. Esquivel Rios (Eduardo27)
2012-07-07 20:28:13 CDT (-0400)

Pero los ascosporos no parecen de Xylariaceae

New photos
By: Christian (Christian Schwarz)
2012-07-07 20:13:19 CDT (-0400)

of mature ascocarp heads look good for Poronia

epic obsie with great follow-up…
By: Debbie Viess (amanitarita)
2012-07-07 19:54:04 CDT (-0400)

now, if only we can find the right match! ;)

By: Eduardo A. Esquivel Rios (Eduardo27)
2012-07-07 15:09:27 CDT (-0400)

Hoy encontre un especimen con ascocarpos maduros, pero lo que me confunde es que los ascosporos son bicelulares, y en Poronia son unicelulares.

interesting article on anamorphs of Xylariaceae here:
By: Debbie Viess (amanitarita)
2012-07-06 11:56:44 CDT (-0400)


not that I am convinced that this is what we have here; just a bit more background info on anamorphs vs teleomorphs.

keep observing these fruit bodies, Eduardo! if Stillbellaceus, they won’t produce ascospores. Stilbellaceus fungi are also associated with dung.

your mushroom is in its imperfect form…
By: Debbie Viess (amanitarita)
2012-07-06 11:11:00 CDT (-0400)

and only produces conidiospores.

this fits the description for a Stillbellaceus fungus.

By: Eduardo A. Esquivel Rios (Eduardo27)
2012-07-04 22:35:02 CDT (-0400)

Agrego una foto reciente del mismo especimen, los “sombreros” se han vuelto discoidales…pero no se observan ascocarpos…voy a tratar de encontrar un especimen mas viejo para observar sus caracteristicas…

just heard back from eastern asco person Roz Lowen…
By: Debbie Viess (amanitarita)
2012-07-04 21:19:37 CDT (-0400)

From Roz Lowen, published here with permission:

“The 2nd collection in MO (998358) is definitely a stilbellaceaus fungus. It is similar to Dendrostilbella prasinulus Hohnel. But the host should be angiosperm wood, and the conidia are more cuboidal than oblong in the MO collection. The color and phialides are similar.

See studies in Mycology 27 1985. A monograph of Stilbella… by Keith Sieferrt.

I only know of Poronia punctata on dung—and what I read is a questionable

Roz Lowen

all very intriguing…
By: Debbie Viess (amanitarita)
2012-06-28 13:47:58 CDT (-0400)

perhaps this mushroom has different forms when it is an anamorph vs a teleomorph??

all of these various Poronia descriptions share some similarities (and differences) with what Eduardo shows here.

I wish that the cap photos were sharper, though. Can’t really discern details.

Dude, where’s my perithecia? ;)

see what you make of this:
By: Danny Newman (myxomop)
2012-06-27 13:01:43 CDT (-0400)

another hemispherical sp. is listed further in (P. agariciformis), but not only is its reported substrate “a stump,” the name isn’t recognized by either IF or MB.

By: Danny Newman (myxomop)
2012-06-27 12:32:27 CDT (-0400)

Possible, but the “cap” coloration and lack of any visible perithecia go against that article’s description of P. pileiformis, at least judging by these potentially immature specimens.

I agree that the microphotos are probably of conidia. If so, it’d be nice to know whether or not the production of asexual spores precedes or follows that of sexual ones. That’d be one way to tell where these lie on the maturity spectrum.

By: Debbie Viess (amanitarita)
2012-06-27 11:32:50 CDT (-0400)

I read your proposed name on the first go round as “Xylaria, the genus” which of course it is not. Never bothered to correct my initial vote; we had moved on to other genera.

It’s an imperfect world, even here on MO! ;)

I believe that your genus suggestion of Poronia was good, and maybe we have even now found a species that works for this interesting mushroom.

Once again
By: Christian (Christian Schwarz)
2012-06-27 11:21:22 CDT (-0400)

this issue comes up: Poronia is in the Xylariaceae… I wish we had figured out a way to cast votes for Species, Genus, Family so that they didn’t come at each other’s numerical expense.

It’s a bit misleading for folks who are just browsing.

we’re getting closer…
By: Debbie Viess (amanitarita)
2012-06-27 10:56:43 CDT (-0400)

could be Poronia pileiformis. Grows on dung, has a “bulbous base” buried in the substrate, very long stalk, cap starts out concave, flattens somewhat. when mature, cap is covered with stromata/perithecia and the underside (fluffy white material depicted here) turns black.

Here’s a link to photos and descriptions. Check out the cool elephant dung Poronia, too! ;)


here’s a link to an online photo of P. oedipus…
By: Debbie Viess (amanitarita)
2012-06-27 10:50:32 CDT (-0400)
I have the NZ Dung Fungi book here at home…
By: Debbie Viess (amanitarita)
2012-06-27 10:27:29 CDT (-0400)

it is lavishly illustrated.

The only sp. of Poronia that is known to occur in NZ is P. oedipus, which looks nothing like this fruit body.

But with those cap details, it does indeed look like an immature asco; perhaps what you found were conidiospores? I think that you will need mature fruit bodies to ID this curious fungus.

Great find and fab thumbnail photo, regardless of eventual name.

ascofrance might have a lot of them picture
By: Jonathan M
2012-06-26 21:09:54 CDT (-0400)

most of them are much more small and don’t do stalk to my knowledge

coprophilic Sordariomycetes
By: Danny Newman (myxomop)
2012-06-26 19:57:09 CDT (-0400)

I got this list from Dung fungi: an illustrated guide to coprophilous fungi in New Zealand when more of it was searchable on google books:

Delitschia / Trichodelitchia

which were all of the dung-loving Sordariomycetes genera listed in its key. this article:


lists three more:


Photographs are sparse for any of these outside Poronia, sadly.

By: Eduardo A. Esquivel Rios (Eduardo27)
2012-06-26 16:45:21 CDT (-0400)

Si es similar a Poronia pileiformis, pero no encontre ascocarpos en ninguno, tal vez estan inmaduros. De cualquier forma deje algunos in situ, voy a esperar a que maduren. Sin embargo en Poronia la estructura es globosa y la parte inferior negra, y en este especimen es una sombrilla, con tejido blanco debajo.

By: Christian (Christian Schwarz)
2012-06-26 16:35:55 CDT (-0400)

Compara con Poronia. Algunos tienen sclerotios. Estos se me hacen immaduros.

By: Eduardo A. Esquivel Rios (Eduardo27)
2012-06-26 16:02:21 CDT (-0400)

Si, son esclerocios, que estaban dentro del excremento de vaca, pero no estoy de acuerdo que sea Xylariaceae, es bastante raro, al menos que haya algun basidiomiceto que forme esclerocios…

very cool collection; sure you didn’t save it?
By: Debbie Viess (amanitarita)
2012-06-26 15:44:00 CDT (-0400)

any more details that you can tell us about?
those lumps look like sclerotia rather than dung.

Created: 2012-06-26 13:24:39 CDT (-0400)
Last modified: 2017-10-29 01:11:26 CDT (-0400)
Viewed: 1186 times, last viewed: 2017-12-04 13:45:05 CST (-0500)
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