Читать книгу The Isles of Scilly - Rosemary Parslow - Страница 57

Most of what could be called the ‘middle’ of St Agnes is cultivated, mainly as bulb or arable fields, and it includes the three ‘towns’, Higher, Middle and Lower Town. Inland, St Agnes is a made up of a nucleus of small fields, farms and houses. Many of the fields have a good arable weed flora and between hedges are glimpses of delightful gardens full of exotic plants. Some of the garden walls have some of the best collections of lanceolate spleenwort Asplenium obovatum in the islands.

Wherever you are on St Agnes you are aware of the lighthouse perched on the hill in the middle of the island. The fat white tower dominates the landscape and appears to squeeze into every photograph (Fig. 49). St Agnes lighthouse was built in 1680, making it one of the oldest in Britain. Initially the light was supplied by a cresset, a coal-burning brazier, which stood on a platform in the lantern. This was not very efficient and was replaced by copper oil lamps and revolving reflectors in 1790. The wind vane on top of the lantern is 22.5 metres above the ground, 42 metres above mean high water mark (Bowley, 1990). When the Peninnis Head lighthouse came on line in 1911 the St Agnes light was downgraded to a daymark. The lighthouse keeper’s house is now a farmhouse. Just below the lighthouse hill is the former parsonage in a grove of trees. In migration times a constant stream of birdwatchers patrol the road outside the parsonage in the hope of seeing some really unusual bird that has been attracted to the dense cover in the garden (Fig. 50). Quite often, if they are lucky enough to glimpse a Pallas’s warbler Phylloscopus proregulus or some such rarity, it will flit across the road to disappear out of sight behind the massive wall of the lighthouse garden.

The northern part of the island is flat, low-lying and sandy, with a large meadow and a few former hayfields towards the rocky headland of Browarth. From the hill near the lighthouse you can see the almost perfect circle of Big

FIG 49. St Agnes: cattle grazing beside the lighthouse, May 2005. (Rosemary Parslow)

FIG 50. Pied flycatcher near St Agnes lighthouse. The gardens of the parsonage and the lighthouse attract many passage migrants. (D. I. M. Wallace)

Pool in the meadow (Fig. 51). Both the pools here (there is also a Little Pool nearby) are surrounded by grassland on low-lying land with the sea on two sides. The sea occasionally floods the meadow area, although recent sea defences have reduced the frequency. At other times the pools flood after heavy rain and the leat connecting Big Pool to the sea has to be opened at low tide to release the water. So, although usually freshwater, Big Pool may at times be slightly brackish. Around the pools are successive rings of vegetation: sea club-rush succeeded by saltmarsh rush, marsh pennywort, then creeping bent Agrostis stolonifera. Big Pool contains a few aquatic species, usually fennel-leaved pondweed but on occasion beaked tasselweed. The pool attracts very few breeding waterfowl, but is important at migration times. There are two resident Odonata species, common darter dragonfly Sympetrum striolatum and blue-tailed damselfly Isnura elegans. Frequently there are very large common eels in the pool and occasionally a heron Ardea cinerea will be seen standing in the pool, struggling to swallow one that has wrapped itself around its neck. These drawn-out battles between fish and bird can last for many minutes before the heron manages to swallow the fish or gives up and lets it go.

The meadow is also the local cricket pitch (as well as the tennis court and occasional helipad, especially in winter), with a species list that includes a

FIG 51. Big Pool and the chamomile cricket pitch, St Agnes, February 2004. (Rosemary Parslow)

number of rare and unusual plants including autumn lady’s-tresses, chamomile and several rare clovers. Most of the meadow sward around the cricket pitch is kept short by mowing, or elsewhere by rabbit and cattle grazing. The only site in Scilly for common adder’s-tongue fern Ophioglossum vulgatum is under bracken on the edge of the meadow. Nearby in the cart ruts left by tractors in the sodden turf can be found two species of spike-rush, slender spike-rush Eleocharis uniglumis and many-stalked spike-rush E. multicaulis, as well as another rarity, early meadow-grass, and tufts of the tiny club-rushes Isolepis setacea and I. cernua.

Just west of the meadow is the harbour of Periglis. Here are the former lifeboat house and the remains of the longest lifeboat slip in Scilly, although the shallowness of the incline meant it never functioned properly. Periglis is the main harbour for the islanders’ boats and is very sheltered from most directions. There is a low dune at the back of the bay with typical dune plants including sea-kale, sea bindweed Calystegia soldanella and strandline species where the sandy beach gives way to rocks and boulders towards the north in one direction and towards the quay in the other. Burnt Island is a small island that lies to the northwest of Periglis, joined to St Agnes by a reinforced boulder-filled gabion at Ginamoney Carn. The island is low-lying and rocky, mainly covered in maritime grassland, bracken and thrift. At the furthest extremity of Burnt Island is Tin’s Walbert, a large rock promontory that can only be reached at low tide.

To the east of the meadow is a large and very rocky bay, Porth Killier, and round the next promontory into Porth Conger is the main quay where passengers and freight are landed. South of the bar which links St Agnes to Gugh is the large inlet of the Cove, in which is found the very popular small bay of Covean. Besides attracting sunbathers to its warm, white sands, this can often be the stopping-off place for migrant birds, and sometimes there are willow warblers Phylloscopus trochilus, flycatchers and other birds flitting in and out of the tamarisks and snatching flies from the sand between the sunbathers. Just above the path from Covean to the Bar is a suite of fields with very sandy soils. Most of these have a particularly impressive arable weed flora and are often very colourful with corn marigolds, the ‘whistling jacks’ gladiolus Gladiolus communis byzantinus, fumitories and smaller tree-mallow.

The whole southern part of the island delights in the charming name of Wingletang Down, an extensive stretch of maritime heath with the twin bays of Wingletang Bay on the east and Porth Askin on the west, with the rocky promontory of Horse Point at the southern tip of the island where the land falls into the sea among short maritime grassland and a great chaos of tumbled rocks. Horse Point is almost separated from the rest of the island by the two bays and a narrow sandy neck of land, and it seems highly probable that one day it will eventually be cut through. In the middle of Wingletang Bay is Beady Pool, so named because it is where the small barrel-shaped brown beads from a seventeenth-century wreck have been found. At the back of the bay yellow horned-poppy, sea-kale and sea spurge surmount the low dune bank. Shore dock once appeared in a sand pit here (illicit digging possibly having exposed buried seed), but died out after a few years to reappear in a dune blow-out on the opposite side of the island beside Porth Askin; unfortunately it soon died out there as well. Wingletang Down is very important botanically: rarities such as orange bird’s-foot and small adder’s-tongue fern grow here, but it is also the only locality in Scilly for the very rare least adder’s-tongue fern, known in Britain only from here and the Channel Islands.

St Warna’s Cove is a rocky, south-facing bay on the west of St Agnes. This section of the coast is studded by a number of huge carns that continue right around the west side of the island (Fig. 52). The cove is overlooked by a curiously shaped rock called Nag’s Head on the heathland below the distinctive outline of the coastguard cottages (Fig. 53). And close to the shore is a stone-lined well that is possibly of great antiquity – it is reputed to be close to where the saint is supposed to have landed from Ireland in his coracle. Traditionally pins should be dropped in the well to encourage storms to drive a wreck ashore! Castella

FIG 52. Granite carns at St Warna’s Cove, St Agnes, August 2003. (Rosemary Parslow)

FIG 53. The Nag’s Head and the coastguard cottages, St Agnes, July 2002. (Rosemary Parslow)

Downs, an area of rabbit-grazed coastal grassland and rough heathland further to the west, is where the Troy Town maze, actually a pebble labyrinth, is set in the turf