Craig-y-Llyn
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Geology & landscape
Geological Period: Quaternary · Rock Type: Sandstone
Landscape processes: Glacial
Description
Description Two north-east-facing hollows cut by Pleistocene ice or snow in the edge of the Pennant Sandstone Plateau. The high cliffs, ravines and flushes support many montane species including Sedum rosea, Hymenophyllum wilsonii, Huperzia selago on the cliffs and the moss Andreaea rupestris on flat boulders on the plateau. In Llyn Fach occur Lobelia dortmanna, Isoetes lacustrisis and Sparganium angustifolium in its southernmost locality. Analysis of the pollen preserved in Ffos Cenglau has yielded data on the post-glacial sequence of woodland types in South Wales.
Species mentioned
Show the 6 species mentioned in the description, with red-list status| English name search for this in other sites |
Latin name search with Google |
IUCN / Red List | Type | Family |
|---|---|---|---|---|
| Wilson's filmy-fern | Hymenophyllum wilsonii | VU | fern | hymenophyllaceae |
| water lobelia | Lobelia dortmanna | LC | herb | campanulaceae |
| golden root | Sedum rosea | Not listed in GB list | herb | crassulaceae |
| black rock moss | Andreaea rupestris | LC | moss | andreaeales |
| fir clubmoss | Huperzia selago | LC | moss club | lycopodiaceae |
| floating bur reed | Sparganium angustifolium | LC | reed | sparganiaceae |