Area: 3.4 hectares.
Description and Reasons for Notification:
This site contains an unusually herb-rich valley mire, together with a good variety of invertebrates, including some rarities.
At an altitude of approximately 140 m the site is located within the shallow valley of a small tributary of the River Tavy. The site lies over impervious slates and several springs issue from the gentle slopes, resulting in waterlogged ground below.
The wettest areas are characterised by hummocks of bog moss Sphagnum spp. together with devil’s bit scabious Succisa pratensis, common yellow sedge Carex demissa, carnation sedge C. panicea, mat-grass Nardus stricta and purple moor-grass Molinia caerulea. Associated plants include round-leaved sundew Drosera rotundifolia, oblong-leaved sundew D. intermedia, pale butterwort Pinguicula lusitanica, bog pimpernel Anagallis tenella, bog ashphodel Narthecium ossifragum and white beak-sedge Rhyncospora alba. The site also supports a rare plant of interest for being well away from its main centre of distribution. Where pools of water collect, bog pondweed Potamogeton polygonifolius, lesser spearwort Ranunculus flammula and round-leaved crowfoot R. omiophyllus occur.
Carpets of bog mosses have developed elsewhere, supporting many flowering plants, including lesser skullcap Scutellaria minor, ivy-leaved bellflower Wahlenbergia hederacea, marsh St John’s wort Hypericum elodes, marsh violet Viola palustris, and lousewort Pedicularis sylvatica.
Cornish moneywort Sibthorpia europaea, a plant with a restricted distribution in Britain, grows along the banks of the stream which are lined with alder Alnus glutinosa and willow Salix sp.
A diverse invertebrate fauna is present, with at least ten species of dragonfly recorded. These include southern hawker Aeshna cyanea, beautiful demoiselle Calyopteryx virgo, golden-ringed dragonfly Cordulegaster boltonii and the local white-legged damselfly Platycnemis pennipes.
The nationally scarce high brown fritillary Argynnis cydippe and a nationally rare cuckoo bee, Nomada tormentillae, also occur here.