Observation 198256: Punctularia atropurpurascens (Berk. & Broome) Petch

This specimen was given to me at the San Francisco Mycological Society Fungus Fair, by ???? (sorry I don’t remember the name), who had a strong interest in polypores. The purple color is very distinctive, and I’m sure I have seen this before and not successfully identified it. The current specimen does not seem to be mature as I could not find fertile basidia or spores, but it does have dendrohyphidia, and clamps, which are consistent with the ID. The ITS sequence is a 95% match to P. strigososonata. This what the identification is primarily based on. The match to the species is poor enough that it probably is something slightly different but related. It also has needle-like crystals (see last photo) which I do not see in the description of P. strigososonata.

Here is the ITS sequence:

Species Lists


note dendrohyphidia projecting from hymenium
Linear purplish crystals

Proposed Names

26% (2)
Based on chemical features: ITS Sequence
18% (2)
Based on chemical features: BLAST results show 99-100% match with sequence of a collection from Santa Cruz, CA
29% (3)
Used references: current name according to IF and Elia Martini

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Punctularia literature:
By: Django Grootmyers (heelsplitter)
2018-02-10 16:35:37 PST (-0800)

2 Punctularia species are reported from North America in “The resupinate non-poroid Aphyllophorales of the temperate northern hemisphere”, strigosozonata and atropurpurascens. Macro and micro features shown here seem consistent with atropurpurascens.

Unlikely to be the same species in all those places
By: Tom Bruns (pogon)
2018-01-15 20:41:52 PST (-0800)

One thing you have to remember is ITS is a pretty conservative marker. There are many examples of the different species that have the same ITS sequence, and when you have something with limited dispersal found across continents chances are high it is not exchanging genes. Morphologically, or by ITS, or by both, it could all be one species, and that may be fine for most purposes (including MO), but if you dug down in the genetics you’d certainly find multiple species over a geographic range that large unless recent introduction was involved.

Doesn’t match P. strigosozonata morphologically
By: Alan Rockefeller (Alan Rockefeller)
2018-01-15 18:59:36 PST (-0800)

So either the sequences in UNITe are mislabeled (very likely), or this is an extremely close relative that doesn’t make shelf-like fruiting bodies. (not likely)

Whatever it is, it occurs in Italy, Costa Rica and California.

Punctularia atropurpurascens remains a possibility, and a description of that is here: http://www.speciesfungorum.org/.... Punctularia subhepatica is a deprecated synonym of Punctularia atropurpurascens according to Index Fungorum.

Can you suggest some good Punctularia literature?
By: Alan Rockefeller (Alan Rockefeller)
2018-01-15 18:11:09 PST (-0800)

Looks like microscopy is the way forward with this.

The sequence match probably was not IDed morphologically
By: Tom Bruns (pogon)
2018-01-15 16:37:06 PST (-0800)

I don’t know Punctularia species and neither did Lisa Rosenthal, so the identification of the collection it matched to: “Punctularia subhepatica voucher UC2022981”, which was our collection, itself must have been identified by sequence. When I reblast the above sequence now in UNITE it’s a perfect match to Punctularia strigosozonata; UNITE sequence: UDB028313, but I notice that in NCBI the AFTOL collection of Punctularia strigosozonata, which is the next closes ID, is not a particularly good match. So I’m not sure what is going on. Punctularia seems right, but the species ID is ambiguous.

You aren’t reading the results wrong
By: Alan Rockefeller (Alan Rockefeller)
2018-01-15 14:16:47 PST (-0800)

The closest match is 2 nucleotides away. Without seeing the chromatograms it’s hard to say if they are sequence anomalies or actual differences, but since the differences are at the beginning and end, that makes anomalies pretty likely. I am pretty sure they are the same since it’s a sequence from Santa Cruz, California and this does not appear to be a tight species cluster, as the next matches are 95%. The only question is how https://www.ncbi.nlm.nih.gov/nucleotide/KP814559.1 was identified; microscopy should be checked.

I thought it was 99%
By: Danny Newman (myxomop)
2017-02-20 10:01:34 PST (-0800)

but there’s a very good chance I’m reading the results wrong:

Maybe P. atropururascens sensu lato, but its unlikely to be the same biological species
By: Tom Bruns (pogon)
2017-02-20 08:52:28 PST (-0800)

Danny – This may fit the gross morphology of P. atropururascens, but with only a 95% ITS match to it, it seems like it must be something a little different. Perhaps an undescribed North American version of it. In any case we need more collections and especially some that are mature and fertile.

finding this useful
By: Danny Newman (myxomop)
2017-02-19 12:35:33 PST (-0800)


in reconciling the lack of purple in the Martini description. fitting that this would have been confused for a Ptychogaster throughout its taxonomic history. I’m leaning more toward P. atropurpurascens being the right name after all. any future observations of this stuff should contain detailed analyses of microstructures, whether sexual or asexual, to help clinch the ID.

could be
By: Danny Newman (myxomop)
2017-02-19 12:26:46 PST (-0800)

right now I’m wondering a few things

1. Is this truly and definitely P. subhepatica?

2. Is P. subhepatica truly and definitely the same as P. atropurpurascens?

3. Are this material, the collection linked from MycoPortal, and Observation 199880 all the same thing?

4. Is Elia Martini’s writeup of that species lacking pictures/mention of the fuzzy purple-ness and exudation that ought to be there, or is the thing on pg. 488 of MotRC a different animal? Does the difference in substrate (Pinus and Acacia for Elia’s material, live oak in MotRC) matter?

Is this the “purple fuzz” on page 488 of the Redwood Coast book?
By: Tom Bruns (pogon)
2017-02-19 11:56:20 PST (-0800)
Yes, there are multiple purple corticioids
By: Tom Bruns (pogon)
2015-03-10 12:25:18 PDT (-0700)

Hi Danny, – sorry I didn’t remember that you gave me the specimen. I glanced at list of observations you gave below, and I think most or all of them are right. There just are a few purple taxa, and this one may not be the most common. I think for mere mortals like you and I it takes a microscope to sort them out, at least initially. Maybe after you have picked them up a few times they start to sink in. The Punctularia you handed me seemed more fuzzy than Chondrostereum I’ve seen, and more solid than Byssocorticium. But given that it was not mature, I never would have IDed it without the sequence. Next time, maybe. – Tom

that would be me, Tom
By: Danny Newman (myxomop)
2015-03-10 12:00:43 PDT (-0700)

I’m glad this actually made it through the assembly line. I thought for sure I had an observation up of this already, but I don’t appear to have uploaded anything from the fair. I’ll remedy that sometime soon.

The question now is to which of these:


this name can be rightly applied.

Created: 2015-02-07 12:32:39 PST (-0800)
Last modified: 2018-02-10 16:36:59 PST (-0800)
Viewed: 249 times, last viewed: 2018-05-20 08:33:37 PDT (-0700)
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