sq358's picture

Fern (Probably Polypodium agg) with Spore Sacs

Observed: 5th April 2010 By: sq358
S159 Neighbourhood Nature - current student
sq358’s reputation in Plants
Polypodium Vulgare.JPG
Description:

I think this is a Polypodium (polypody), but it might be one of the Dryopteris types.

Identifications
Species interactions

No interactions present.

Comments

Chris Metherell's picture

Polypodium species.

A Polypody as you say, unfortunately the only way to tell the three (at the moment) species apart is to examine the sporangia under a microscope!! It is possible to allocate "typical" specimens to species with a degree of confidence, but even then the error rate is reportedly rather high. I reckon I get about 40-50% right! Best to put it down as Polypodium agg unless you're going for the full microscopy.

Chris Metherell
BSBI VC Recorder
North Northumberland

sq358's picture

Okay, I'll change it to

Okay, I'll change it to "agg". It was taken a month ago.

gardener's picture

Have you got any photo's that

Have you got any photo's that show the whole frond from above as the shape can give a bit of a clue to which Polypodium species?
The frond at the top of the picture definitely doesn't look like P. vulgare.

This link shows all three Polypody's:
http://www.irishwildflowers.ie/pages-ferns/f-9a.html

sq358's picture

Alas, it was taken a month

Alas, it was taken a month ago, while I was lost and before I knew that I was going to be submitting it here, and I'm not sure I can find it again.