Sunday, September 17, 2023

Quillwort at Llyn Carw


Llyn Carw - about 6 km trek across difficult moorland from Dolymynach.

The Cambrian Mountain Society teamed up their walking expertise with botanists last week on this walk to our most remote lake. 

Quillwort was found there in 1979 by Ray Woods and determined to be the rather more rare Spring Quillwort, Isoetes echinspora by S G Harrison at the National Museum of Wales. (He was a co-author of the book that describes them for Wales.)

It was at that time “Common on north and west margins”.

Gill Foulkes, a botanist member of the recent expedition, did find a Quillwort on the other side of the lake. (None was found where the original sample was taken.)

Here it is:
The Quillwort found by Gill Foulkes last week, which turned out to be Isoetes lacustris

You have to sacrifice a leaf to prove it's a Quillwort:

And knowing which one needs these megaspores to be examined:
They are about 0.5 mm across...

So maybe the lake does actually still have both of these Quillwort species (the north and west has the more suitable habitat for Spring Quillwort).

Further expeditions are required!

And the members of this walk did prove that botany and long walks can be compatible - with a good recce prior to the day...

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