Observation 196550: Annulohypoxylon Y.M. Ju, J.D. Rogers & H.M. Hsieh
When: 2015-01-16

Notes: Fruiting gregariously and fusing atop a badly decayed log.

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Thank you again, Roo, for
By: Judi T. (AvidAmateur)
2015-03-19 17:45:21 CDT (-0500)

all your helpful comments and for the great references you always provide. These types of little “crusty guys” are so ubiquitous in the areas I frequent, and they are so interesting to me. I am always fascinated to learn more about them. Unfortunately, I don’t have a microscope available to me at this time nor anyone nearby who could mentor me in developing my knowledge in this area. As you may be aware, little if anything about crusts and/or parchments is included in the field guides currently on the market for amateurs such as myself. Hopefully someone (maybe you???)will one day publish a guide strictly for crusts for those of us who would like to learn more. In the meantime, I shall continue to be intrigued by them … and frustrated by my lack of knowledge in this field:)Thanks again.

I take it back!
By: Roo Vandegrift (Werdnus)
2015-03-13 21:02:18 CDT (-0500)

There is NOT still a good probability of this being A. multiforme — it is most likely A. truncatum, but there are still a lot of other things it could be.

I got a bit confused about A. multiforme, because I actually didn’t remember it having discs, which ordinarily would make it a true Hypoxylon. But from Hsieh et al. (2005), “…A. multiforme (and its var. alaskense Y.-M. Ju & J.D. Rogers), is characterized by lacking ostiolar disks…” Turns out, there is a small sub-group of Annulohypoxylon that lacks the disc: the other distinguishing feature between the genera is a hard, thickened carbonaceous layer around the individual perithecia in Annulohypoxylon, which is absent in Hypoxylon.

Annulohypoxylon
By: Roo Vandegrift (Werdnus)
2015-03-13 20:32:25 CDT (-0500)

Ah, I don’t know why no one has depreciated that synonym yet! The “section Annulata” of genus Hypoxylon was split out into the genus Annulohypoxylon back in 2005.

Hsieh, H. M., Ju, Y. M., & Rogers, J. D. (2005). Molecular phylogeny of Hypoxylon and closely related genera. Mycologia, 97(4), 844-865.

Hypoxylon and Annulohypoxylon are almost impossible to identify without looking at the spores — I advise caution when assigning names beyond the genus level for these guys. There are probably about a dozen species this could be, even discounting the fact that there are clearly many undescribed species of Xylariaceae in North America still. That said, there’s still a good probability that this is A. multiforme, it’s just far from certain. That same website has a great key for Annulohypoxylon if you can get spores out. http://mycology.sinica.edu.tw/...

Created: 2015-01-17 19:56:01 CST (-0600)
Last modified: 2015-03-19 17:28:21 CDT (-0500)
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