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Mystery fern #877413

Asked July 16, 2024, 12:35 AM EDT

Hello Master Gardener folk, I have a small collection of fern that I hope you might help me identify. They're well established (at least since 1991 when I bought the house) and until this year, have been thriving. This year a number of them have been very slow to return. They completely slump in the winter, and in early spring I cut them back so as not to disturb the new growth when it unfurls. I thought the mature fronds were up to 36" long, but can't find a photo of them to be sure. I just measured one of the largest ones, and it's 30". This year's mass is only about 40% of what it usually is, although what is there appears healthy. What's odd is that it is still sending up new fronds, even today, as opposed to them all unfurling in the spring. Since that horrendous storm of January 13 (of which we were in the epicenter!) took out two huge doug firs, their location is now one of part blazing sun rather than all shade. There's enough sun that several fronds have burnt to a crisp at the ends. We've got a big umbrella over them, but that's a temporary thing to be sure. I'm hoping it's a native and therefore may well adapt to its new normal. They grow from a sort of a log. Unlike my sword ferns that are rooted right into the ground, these guys have prostrate trunks that are maybe 3" in diameter, and some have 2 or 3 branches the same size as the trunk, at the end of which is another fern. A few of them had the usual clenched monkey-knuckle gonna-unfurl-into-new-frond thing happening (sorry, I don't know how else to describe it), but as spring and finally now summer is progressing, most of them are just sitting there. Some are awakening now. I'll attach a few photos, hopefully that will give you some idea of what I have. The first is just an all over shot; the 2nd shows one of the newer fronds; and the 3rd shows the "log" I tried to describe, running left to right across the center of the frame. The side of a newer frond is along the bottom, and the place where the usual new growth would have come from, the "monkey-knuckle" as I'm calling it, is at the far left, situated between the 1st and 2nd leaves of that side of the frond (although you can't see it -- the bend over dried stem ends are in the way). On the far right, there's another place where I'd pruned back the old growth in favor of the new (that never appeared), and just above that, you can see the green stem ends of two fronds that disappear to the right -- those are coming off one of the "branches" of the log thing. I am so sorry if I've gone on and on!! My best wish is that you take one look at the photos, and go, "oh, that's a _____", and I've babbled on needlessly. In any event, I truly appreciate your time and efforts, and look forward to any info you can share. Thank you kindly, ~ Debbi Robertson down in Lake Oswego, in Lake Grove

Clackamas County Oregon

Expert Response

Thank you for your question, Debbi.  We believe it to be this species:  https://pnwplants.wsu.edu/PlantDisplay.aspx?PlantID=121

Hope this is helpful.
An Ask Extension Expert Replied July 16, 2024, 3:39 PM EDT
Hi Extension folks,
I wish my photos were of more help to identify my fern.  Alas, it's not an Ostrich Fern (although I wouldn't mind having some around).
Back to the drawing board I go, as I thank you for your efforts.
 ~Debbi

On Tue, Jul 16, 2024 at 12:39 PM Ask Extension <<personal data hidden>> wrote:
The Question Asker Replied July 18, 2024, 7:51 PM EDT
These are most likely lady ferns, Athyrium filix-femina. You can read a description here, https://web.pdx.edu/~maserj/ESR410/Athyriumfelix.html.  They should be somewhat tolerant of sun, so hopefully they'll survive their suddenly new sunny surroundings!

https://www.fs.usda.gov/wildflowers/plant-of-the-week/athyrium_filix-femina.shtml
Sylvan Kaufman Replied July 21, 2024, 9:04 AM EDT
Oh, hooray!  I think that's it!  The link you sent was very helpful, and I did a bit more research and by George, I do believe I have a patch of lady ferns.  I am so happy to know that now, and am so grateful to your knowing yourself and sharing with me.   You have truly made my day!
Aloha,
~ Debbi

On Sun, Jul 21, 2024 at 6:04 AM Ask Extension <<personal data hidden>> wrote:
The Question Asker Replied July 21, 2024, 6:05 PM EDT
You are very welcome!  Hope you enjoy the fern patch for many years to come.
Sylvan Kaufman Replied July 23, 2024, 10:07 AM EDT

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