Now that you know the Intermediate Wood Fern, the Spinulose Fern is just an easy step away.
Here's the fern from yesterday, Dryopteris intermedia, the Intermediate Wood Fern, again. Remember that it's evergreen through most winters, has a broad triangular blade, it is thrice divided, and that the second pinnule from the rachis is longer than the first. Just got here? Take a look at yesterday's post. BUt it's not too tough. In the picture the "sub-leaflets" noted by the yellow arrows are longer than those with the red arrows.
Now here is a closeup of the same section of the Spinulose Wood Fern. For UK readers, it's your Narrow Buckler Fern. Its Latin name is either Dryopteris spinulosa or Dryopteris carthusiana, depending on whom you ask.
Spinulose means spiny. That name seems to come from the pointed teeth on the pinnules. "Carthusiana" comes either from the name of the village in France where it was first collected, and/or from the botanist Johan Friedrich Cartheuser.
It has almost all of the same superficial characteristics of the Intermediate Wood Fern. They are in the same Genus (Dryopteris) so that makes sense. Here's the most obvious difference. The pinnule closest to the rachis is longest. The one with the red arrow is longer than the one with the yellow.
Now you know! This picture was taken a year ago, at Letchworth State Park of New York. But it is seen here in Michigan too. I just don't have a local picture yet.
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