Observation 112724: Fungi Bartl.
When: 2012-10-07
No herbarium specimen


Fungus appears to colonize the tips of fern fronds, then work toward the center vein.
Fungus forms reddish discolored areas first, later becoming black.
Close-up of underside of frond. Affected area can bulge out of the bottom, creating a sort of cup to store water in.
Another view of the underside of the frond. Sharp edges at tips of frond help fern rid iitself of excess water.

Proposed Names

29% (1)
Eye3 Eyes3
Recognized by sight: On Polystitchum munitum, aka Sword fern, is an ubiquitous part of the environment of Oregon and Washington. As is rain. Apparently it is frequently colonizes by several species of fungi as well during cool wet weather. Hopefully someone can suggest which of several possibilities this collection is.
28% (1)
Recognized by sight: What is ruling out virus, bacteria, and insect based causes? I usually don’t find anything when I scope leaf fungi unless I see clear fungal formations.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
By: Byrain
2012-10-08 13:35:16 CDT (-0400)

You very well could be right, I’m just putting an alternative idea out there. :)

I’m guessing
By: Daniel B. Wheeler (Tuberale)
2012-10-08 13:25:47 CDT (-0400)

the lack of viral, bacteria and insect damage on fern doesn’t bother you. Sword fern in general is one of the easiest plants to grow because of the lack of viral, bacterial and insect predators. Slugs are another matter, but they rarely bother Sword fern as well. At least once fronds start developing. I have seen slug damage on fern thallus though.

Created: 2012-10-08 08:42:53 CDT (-0400)
Last modified: 2012-10-08 13:10:17 CDT (-0400)
Viewed: 27 times, last viewed: 2017-06-14 06:18:29 CDT (-0400)
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