Observation 220002: Ophiostomatales Benny & Kimbr.

When: 2015-05-30

Collection location: Mount Hood National Forest, Oregon, USA [Click for map]

Who: Danny Newman (myxomop)

No specimen available

Ian reported (as seen in the last image) that atop the slender necks of these tiny sordariomycetous fungi were clear liquid droplets, which eventually turned black over the course of the afternoon. First guess was Gnomonia, but the spores are wrong.

Also uploaded here: http://ascofrance.fr/forum?page=1&id=40239

Substrate: hymenium of unk. polypore

Habitat: unk.

Ecoregion: Cascades Subalpine/Alpine

Collector: Ian Gibson

Collected during the Spring 2015 Meeting of the Pacific Northwest Key Council

Species Lists


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single perithecium with long ostiolar neck and accumulated, black spore mass at the neck’s apex/opening
600x Melzer’s – view of ostiolar neck and squashed perithecium containing dark, xylariaceous spores with pronounced germ slits
substrate and original collection tag
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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
thanks, Randy
By: Danny Newman (myxomop)
2016-04-15 20:24:22 CEST (+0200)

i will look over the paper more carefully, but for now, I am inclined to rule out Melanospora for my fungus given the feedback of the AscoFrance community.

as for Observation 236468, I can’t imagine any ID without micro would be reliable. There are, apparently, many long-necked, uniperitheciate Sordariomycetes which look alike to the naked eye.

Hi Danny.
By: Rand Workman (Ranmofod)
2016-04-15 17:32:36 CEST (+0200)

Re: observation 236468
I may have been the one who suggested the genus Melanospora to her on another forum (with an emphasis of doubt without microscopy to further substantiate the claim). While her’s could possibly be the more common sp., your’s is definitely unique.
Here is the key for Melanospora and “allies”.
Compare to Sphaeronaemella/Viennotidea for your dainty ones that had the drops maybe?
Also check M. caprina & M. zamiae (who knows if any of these names are right anymore) as it appears that you may have 2 spp. there in your first photo, could be intermediates but I don’t see any species that have white droplets AND black tufts.
Good luck!

Created: 2015-10-21 02:09:15 CEST (+0200)
Last modified: 2016-08-14 21:10:02 CEST (+0200)
Viewed: 134 times, last viewed: 2018-01-11 05:59:16 CET (+0100)
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