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Ulmus - the elms
Posted on February 9, 2014 by Ash
I recently came across an interesting passage on a tree that groaned in a dusty tome called Old England: A Pictorial Museum (published by Charles Knight in 1845). The author recounts William Gilpin’s sketch of a rather singular elm from his older and dustier tome Remarks on Forest Scenery; and other Woodland Views (first published in 1791). Here is Gilpin’s original description:
The next tree I shall exhibit from New-forest, is the groaning-tree of Badesley; a village about two miles from Lymington. The history of the groaning-tree is this. About forty years ago, a cottager, who lived near the centre of the village, heard frequently a strange noise, behind his house, like that of a person in extreme agony. Soon after, it caught the attention of his wife, who was then confined to her bed. She was a timorous woman, and being greatly alarmed, her husband endeavoured to persuade her, that the noise she heard, was only the bellowing of the stags in the forest. By degrees, however, the neighbours, on all sides heard it; and the thing began to be much talked of. It was by this time plainly discovered, that the groaning noise proceeded from an elm, which grew at the end of the garden. It was a young, vigorous tree; and to all appearance perfectly sound.
Pests, diseases, disorders, competing growth and unfavourable conditions (a field trip): the diseases
Posted on January 23, 2010 by Ash
Last Thursday my arboriculture class set out from college on a field trip to see a smörgåsbord of pests, diseases, disorders, competing growth and unfavourable conditions afflicting a variety of trees in the vicinity of York and Malton. Some of them were new to me, most I were already aware of, but it was a highly interesting way to spend a day and we got to see some cracking trees. Here’s a quick run-through of the diseases that we saw:
Supermassive sycamore (this photo falls a long way short of doing it justice) with decayed Dryad’s saddles. The one on the floor has fallen off the tree.
Dryad’s saddle (Polyporus squamosus) – A bracket fungi. Described in Jordan’s Fungi 1 as “Large, creamy-brown scaly cap with cream pore-bearing under-surface, annual; parasitic on broad-leaf trees, also on stumps, favouring beech, elm and sycamore.” We only saw old and decaying specimens, but the sycamores (Acer pseudoplatanus) they had grown on were jaw-droppingly colossal - easily the biggest I’ve seen! These ancient sycamores formed an avenue along a road near Birdsall House. I’ve got to go back and get some decent photos of them in the summer before they collapse or get felled for safety reasons.
These crazy patterns are galleries produced by elm bark beetles.
Dutch elm disease – The Big Baddie. The current epidemic is caused by the fungus Ophiostma novo-ulmi, spread by elm bark beetles of the genus Scolytus. It is the most catastrophically devastating tree disease ever recorded in British history. On the field trip we saw a dead elm (Ulmus) replete with bark beetle galleries in the wood beneath the bark.
Cankers on a sycamore.
Canker – There are various kinds of cankers and a variety of causes of cankers. Strouts and Winter 2 define a canker as a “clearly defined patch of dead and sunken or malformed bark”. We saw cankers on sycamore and red horse chestnut (Aesculus x carnea) - a hybrid amusingly described in the Collins Tree Guide 3 as a tree of “rather endearing ugliness”.
Huge ivy-covered canker on a red horse chestnut.
Razor strop on silver birch.
Birch polypore or razor strop (Piptoporus betulinus) – Another bracket-producing fungus, it is restricted to birch (Betula). We saw loads of razor strops on dead and drying silver birches (Betula pendula) in a small piece of woodland that has become waterlogged as a consequence of mining subsidence.
Ganoderma on a veteran English oak.
Ganoderma - A genus of bracket- (polypore) producing fungi that is parasitic on broad-leafed species. We saw a large, dead Ganoderma at the base of a huge and ancient English oak (Quercus robur), but we didn’t identify it to species level. The oak was extremely diseased and its days are sadly numbered.
Slime flux on the same oak.
Slime flux or bacterial wetwood – A bacterial infection causing the host to ooze infected sap from wounds or apparently healthy bark. According to Strouts and Winter 2, bacterial wetwood is “common yet rarely results in overt disease”.
Inonotus hispidus on an ivy-clad ash.
Inonotus hispidus - Another polypore-producer that is parasitic on broad-leaves, particularly ash (Fraxinus excelsior). We saw several dead brackets on an ivy-covered ash growing by a stream.
Fomes fomentarius on silver birch.
Hoof fungus or tinder bracket (Fomes fomentarius) – Like you’d expect, the brackets of this fungus look like hooves. It favours birch – its modus operandi is similar to that of razor strop. We saw several of these brackets on the waterlogged birches.
Posted on May 29, 2009 by Ash
The Porter or Little Don river just above Brookhouse (or Brook House) Bridge. This little section looks nice in the photo but I tell you it’s ten times better when you see it in the flesh on a sunny day. Every time I’ve been there on such a day, as last Sunday was, there’ve been people sunbathing on the flat grassy area and kids playing in the river. I sat myself down on a large, flat stone poking above the water and let the river cool my feet. The babbling of the burn and the beautiful surrounds were highly relaxing and I reposed for almost an hour. The presence of all the people playing and chilling out (there were more than in the photo when I arrived, and there were many more behind me) added to the carefree, summery atmosphere, whereas normally I’d rather be away from the general public while enjoying the countryside.
A lovely, pebbly bit of riverbed next to my rock.
A large sycamore (Acer pseudoplatanus) – just right of centre in the first picture – and Brookhouse Bridge. All the stones in the lower right have built up behind a large weir, built to prevent such sediment from entering Langsett Reservoir, which isn’t much farther downstream. The bridge takes its name from Brook House farm, which had to be abandoned to prevent its livestock polluting the reservoir – Langsett was built to supply the rapidly-growing population of Sheffield with drinking water. There are old books and magazines describing the farm’s unusual rent, payable to the lord of the manor (a modern book has it being paid in 1588, but the older books imply it was a annual arrangement over several years):
BROOK HOUSE, Yorkshire.--A farm at Langsett, in the parish of Peniston and county of York, pays yearly to Godfrey Bosville, Esqre., a snowball at Midsummer, and a red rose at Christmas.
Estates have often been held by the tenure of a rose – a red one – at times being stipulated for, and these floral tributes generally had to be paid on St. John the Baptist’s Day… For Brook House, Langsett, Yorkshire, it is said that a rose had to be provided at Christmas, and a snowball at Midsummer, and as evidently there would often thus be much difficulty in paying the rent, we are probably correct in surmising that in this case a money fine was the alternative.
The weir and the sycamore.
A wych elm (Ulmus glabra) leaf backlit by the sun. Wych elm is the only elm that is undisputedly native to Britain.
A cluster of unripe wych elm samaras (a type of winged fruit). Each samara has a seed centred between two symmetrical wings.
These leaves belong to a field maple (Acer campestre), another tree native to Britain. They always make me think of extra-large hawthorn leaves.
Bluebells are a classic British wildflower, the kind of plant that almost everyone can recognise. But there isn’t just one species in Britain anymore; there are two species and a hybrid. Our native bluebell is the common or English bluebell (Hyacinthoides non-scripta), but there is an alien species about too: the Spanish bluebell (Hyacinthoides hispanica), popular with gardeners and introduced around 1680. Both species hybridise to give the hybrid bluebell (Hyacinthoides x massartiana a.k.a. Hyacinthoides hispanica x non-scripta) which was first noticed growing wild in 1963. The genetics of our native bluebell are therefore threatened by dilution, and a lot of ecologists aren’t happy about that at all. According to Plantlife International, a recent study conducted by their volunteers found one in six British broadleaved woodlands surveyed contained hybrid or Spanish bluebells.
I think that these are hybrid bluebells. Why? Our native species have their bells all on one side of the stem, which droops over with the concentrated weight. Spanish bluebells have a thicker, straight stem with bells all around. The hybrid has bells around a slightly drooping stem - which is an accurate description of the bluebells in this photo.
In case you missed it, here is a link to Part 1 of this four-part series of posts. And here is a link to Bluebells for Britain: A report on the 2003 Bluebells for Britain survey, a leaflet in .pdf format by Plantlife that sheds more light on the subject and gives some simple advice to gardeners.
Posted on October 7, 2007 by Ash
I went for a little stroll down by the Innocent Railway in Edinburgh this afternoon. Next to Holyrood Park, nowadays the railway is just a footpath / cycle path. But it’s still a nice wee place for a wander.
Yellow beech (Fagus sylvatica) leaves. Most of the rest of the leaves on this tree were still green.
A yellowing wych elm (Ulmus glabra) leaf.
A silver birch (Betula pendula). This one had lost about half of its leaves, with the remainder mostly yellow. Other silver birches in the area were almost completely bare.
Flowering ivy (Hedera helix) with part of Arthur's Seat in the background.
The ivy was abuzz with honey bees, flies and wasps. They must have been loving all the flowers.
Crack willow (Salix fragilis) leaves.
I don’t know what kind of tree these red leaves belong to, but they were very nice from a distance.
Fraxinus excelsior) is staying nice and green. Perhaps this is a consequence of the weird weather we had this year: a red hot spring and a soaking wet summer.
This alder also seems determined to remain green a while longer!
Posted on May 2, 2007 by Ash
Close-up of a horse chestnut (Aesculus hippocastanum) inflorescence.
Vivid gorse (Ulex europaeus) flowers. I know gorse isn't technically a tree, but it can grow fairly big, woody trunks!
Some species of elm of which I am not quite sure - probably wych elm (Ulmus glabra.
The bark of a close-by elm of the same species growing on a rocky substrate. Quite a big one; must have avoided Dutch elm disease.
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