: Collections & Research

Most gardeners regard horsetails or scouring rushes (Equisetum) as one of their worst enemies – once this invasive weed is in your garden or allotment, it will spread everywhere and is almost impossible to get rid of (Fig. 1). But of course from the plant’s perspective this is a success story – they are doing what is best for them, not for us!

Today, this genus of highly invasive plants consists of only 15 species (Fig. 2), but they are found throughout the world except in Antarctica. They also have an immensely long evolutionary history spanning over 350 million years.

Fossils of horsetails are commonly found in the Carboniferous age coalfields such as in South Wales. The star-shaped leaf whorls (Annularia) are among the iconic fossils found in these rocks. We now know they were parts of tree-sized plants up to 10 metres or more tall – I have often wondered what today’s gardeners would think if they encountered a living one of these giants!

Fig. 3. Fossil horsetail (Annularia paisii) from the uppermost Carboniferous of Portugal, showing insect gall. Insert shows close-up of gall. Specimen in the Museum of Natural History and Science, Porto (UP-MHNFCP-155167).

A couple of years ago, my colleague Pedro Correia sent me a photograph of a fossil Annularia that he had found in Portugal (Fig. 3). In itself, this wouldn’t have been too unusual, but this one had a strange structure attached among the leaves. It almost looked as though it was a seed but of course that was impossible – horsetails do not have seeds, but reproduce by spores, in the same way as ferns. We shared this photograph with other European colleagues and a debate ensued as to what on Earth this could be. For a time it remained a puzzle. But then we showed it to another colleague, Conrad Labandeira from the Smithsonian Institution (Washington DC), who is one of the world’s leading palaeontological experts on insect – plant interactions. He suggested that this was probably a structure known as a gall.  Most galls today are produced when an insect injects chemicals into the plant to produce a swelling, in which it lays an egg. The resulting larva then develops within the gall.

There is evidence of Annularia leaves having been eaten by insects, such a chew-marks around the leaf edge. Conrad had also published evidence some years ago of an insect gall in a Carboniferous tree fern stem. But a gall on a Carboniferous horsetail is most unusual.  For a time we thought this example might be unique. But we then found a paper published back in 1931 by the American palaeobotanist Maxim Elias, who claimed to have found a seed attached to an Annularia. But it is now clear that Elias hadn’t in fact discovered a seed-bearing Annularia, as he had thought, but an insect gall similar to ours.

Fossil galls of this age are extremely rare. What insect produced this one is unknown. The organism was not preserved and most of today’s gall-producing insect groups do not have a fossil record extending this far back in time. All that we can say is that it was probably caused by a member of a now-extinct insect group that presumably produced larvae as part of its life cycle (Fig. 4).

Most horsetails have thick, almost leathery stems and I still find it rather strange that insects produce galls on them. But they do today on at least some horsetails, and it has clearly been of benefit to insects for millions of years. We haven’t yet found one in the Welsh coalfields but, now we know what to look out for, we will be keeping our eyes open!

Correia, P., Bashforth, A.R., Šimůnek, Z., Cleal, C.J., Sá, A.A. & Labandeira, C.C. 2020. The history of herbivory on sphenophytes: a new calamitalean with an insect gall from the Upper Pennsylvanian of Portugal and a review of arthropod herbivory on an ancient lineage. International Journal of Plant Sciences, 181(4).

In my previous blog I explained what rafting bivalve shells are and how Caribbean bivalves are ending up on British and Irish shores attached to plastics. There are numerous records of non-native bivalves on plastics in the southwest of Ireland and England but nothing has yet been reported in Wales, which is something that I’m trying to rectify. To encourage recording I’m enlisting citizen scientists – volunteers from the general public – who can help to spot and identify these rafting species in Wales. But first of all, I want to check to see if there are rafting species turning up on our shores so I began talking to groups who already go out on the shores to survey, beach clean or educate.

Presenting the rafting project at the annual Porcupine Marine Natural History Society Conference at SAMS (Scottish Association for Marine Science).

In December 2019 I met with a fantastic group of people at PLANED in Narbeth. PLANED have excellent coastal community links and everyone I spoke to was enthusiastic and willing to incorporate the rafting bivalves project into their usual activities of beach cleans, foraging, outdoor activities or education.  They were keen to help record any rafting species that they discover and we talked about how to identify any bivalves found. Since then I have been working on an identification guide that I plan to develop with the help of these community groups.

Pembrokeshire National Parks staff and volunteers looking for plastics at Freshwater West beach

Pembrokeshire National Parks staff and volunteers looking for plastics at Freshwater West beach

Pembrokeshire National Parks staff and volunteers looking for plastics at Freshwater West beach

In early March two colleagues and I attended the annual Porcupine Marine Natural History Society’s

Presenting the rafting project at the annual Porcupine Marine Natural History Society Conference at SAMS (Scottish Association for Marine Science).

Presenting the rafting project at the annual Porcupine Marine Natural History Society Conference at SAMS (Scottish Association for Marine Science).

Presenting the rafting project at the annual Porcupine Marine Natural History Society Conference at SAMS (Scottish Association for Marine Science).

If you would like to help record non-native bivalves on plastics on Welsh beaches then do contact me at Anna.Holmes@museumwales.ac.uk

The National Wool Museum in Drefach Felindre is home to a comprehensive collection of tools and machinery involved throughout history in the processing of woollen fleece into cloth. It also holds the national flat textile collection and the best collection of Welsh Woollen blankets with documented providence dating back to the 1850s. These range from large double cloth tapestry blankets that are now very collectable, to plain white single utility blankets from WWII. In this blog, Mark Lucas, Curator of the Woollen Industry Collection for Amgueddfa Cymru – National Museum Wales, shares his knowledge of the heritage of Welsh blankets and some fine examples from this important collection.

 

Welsh Blankets traditionally formed part of the bottom draw for Welsh brides. A pair of Welsh blankets was also commonly given as a wedding gift. The would have travelled great distances with people moving during the Industrial Revolution looking for work, but wanting to keep a small piece of home with them. Thus, Welsh blankets have found their way across the world, adding a touch of homely aesthetic to a room by day and providing warmth at night.

 

Narrow Width Blankets

Narrow Width Blanket - two narrow lengths stitched together.

Narrow width blankets were the earliest, woven on a single loom. They were made of two narrow widths hand sewn together to form a larger blanket. Single loom blankets of this type were the norm before the turn of the twentieth century when the introduction of the double loom enabled the weaving of broader widths of fabric. However, many of the smaller mills, as well as individual weavers, did not convert to wider looms and, as a result, narrow-loom blankets continued to be produced in significant quantities during the 1920s, 30s and even later.

 

Plaid Blankets

Plaid Blanket

Plaids were popular during the nineteenth century, usually featuring strong colours against a natural cream background. The introduction of synthetic dyes in the late 19^th century allowed weavers to mix more coloured yarns into the designs, although some colour combinations were subtle, others could be gaudy. Many smaller mills continued the use of natural dyes well into the 20^th century. The natural dyes were made from madder and cochineal for reds, woad and indigo for blues, and various berries and lichens for other shades. The National Wool Museum has its own natural dye garden and hosts courses and talks throughout the year on natural dyeing

 

Tapestry Blankets

Tapestry Blanket

Welsh Tapestry is the term applied to double cloth woven blankets, producing a pattern on both sides that is reversible and is the icon of the Welsh woollen industry. Examples of Welsh tapestry blankets survive from the eighteenth century and a pattern book from 1775 by William Jones of Holt in Denbighshire, shows many different examples of tapestry patterns. Double cloth was first used to make blankets, but its success as a product for sale to tourists in the 1960s led to its use as clothing, placemats, coasters, bookmarkers, tea cozies, purses, handbags and spectacle cases. Because of the hardwearing quality of the double cloth weave the material has also been used for reversible rugs and carpeting.

 

Honeycomb blankets

Honeycomb Blanket

Honeycomb blankets are a mixture of bright and soft colours. As the name implies the surface is woven to produce deep square waffle effect giving the blanket a honeycomb appearance. This type of weave produces a blanket that is warm and light.

With the current resurgence of Welsh blankets for a decorative home-style item there is much interest in old blankets and the designs patterns. Antique blankets have become very popular with interior designers and feature heavily in home décor magazines. They are used as throws and bed coverings in modern homes with many high-end textile designers as well as students researching old patterns for inspiration for their new designs.

Caernarfon Blanket

Many of the fine examples in the Museums’ blanket collection come from mills across Wales that ceased production long ago. A highlight is the collection of Caernarfon Blankets. These were produced on Jacquard looms in a range of colourways. Only a few mills used Jacquard looms, which can make complicated designs and pictures. The Caernarfon blankets show two pictures one with Caernarfon Castle with the words CYMRU FU (Wales was) and a picture of Aberystwyth University with the words CYMRU FYDD (Wales Will Be). It is believed that these blankets were first been made in the 1860s, and last produced for the investiture of Prince Charles in 1969. A recent donation to the museum is an earlier example of the blanket featuring two images of Caernarfon castle. Woven by hand it contains a critical spelling error - Anglicising the name to Carnarvon.

 

Juliet Hodgkiss is Senior Garden Conservator for Amgueddfa Cymru – National Museum Wales. She leads a dedicated team of gardeners and volunteers at St Fagans, who care for the gardens and their special heritage plant collections. In response to an increased interest our own gardens and a growing yearning for the beauty of some of our nations’ magnificent great gardens during lockdown, over the past few days we’ve been collecting your questions for Juliet about her work. Here are her answers in our ‘heritage’ version of Gardener’s Questiontime.

What's the best thing about your job?

The best thing about my job is being paid to work in such beautiful gardens.We have such a great variety of gardens, I’m doing something different every day. I also get to meet so many great people through my work - staff, volunteers, visitors, fellow gardeners and more.

Which of St Fagans' gardens is your favourite and why?

This time of year, my favourite part of the gardens is the area by the ponds. Throughout spring, the terrace banks are covered with spring bulbs; daffodils, bluebells and fritillaries, all above a carpet of anemones.  The magnificent Magnolia ‘Isca’ comes into flower first, followed by the cherries and the apples. The latest tree to flower is the Davidia with its giant white bracts, which sway in the breeze, giving its name of the handkerchief tree.​

​Which is the rarest plant in the collection?

One of the rarest plants we have is the Bardou Job rose, which was one of the original roses in the Rosery. This was thought to be extinct, then it was re-discovered by a group of rose enthusiasts growing in the old garden of the head warder on Alcatraz! They propagated from it, and sent us over 6 roses to grow in our gardens.

We also have a collection of heritage potatoes, donated to us by the Scottish Agricultural Research Agency. One of the potatoes we grow is the Lumper, the potato grown at the time of the Irish potato famine. These cannot be bought, so we have to grow them each year to maintain our collection.

Which is the most difficult plant you have to tackle - one that is hardest to maintain?

The most difficult plants to keep are the heritage potatoes. We have to grow these every year to maintain our collection, and most of these old varieties are very susceptible to blight, so require careful management to ensure a good crop.

Which is the most difficult plant to control?

The hardest plant to control is Oxalis, a persistent weed with a clover-like leaf, which multiplies by means of bulbils. These bulbils are spread when the soil is cultivated. It is virtually impossible to eradicate. After years spent trying to weed it out, we now keep it under control with ground cover planting and mulching.

Which is your favourite time of the year in the garden?

My favourite time of year is spring, with the spring bulbs, blossoming trees, the ferns unfurling their fronds, and all the plants in the garden bursting into growth. Everything looks fresh and new, and we gardeners are full of hope for a great year ahead in the garden.

For our avid blog readers, you might recall previous articles about a group of worms which certainly dig! They are the shovel head worms, or to give them their scientific name, magelonids. Shovel head worms are a small group of marine bristle worms (polychaetes), which are sea worms related to earthworms and leeches, with bristles along their bodies. Shovel head worms get their name from their spade-shaped heads, which they use to dig in soft sediments such as sands as muds. They are pretty small and delicate, so although we have them around our coasts, they are often tricky to find. Therefore, they are not as well-known as other marine bristleworms such as lugworms and ragworms, often used by fisherman as bait! Their size also means that they can be pretty difficult to collect, ever tried looking for a worm less than 1 mm wide on a beach? We have! Despite their size they are quite beautiful worms (although, I may be slightly biased!) and like other marine bristleworms they are an important food source for many other sea creatures, and also are the gardeners of the ocean, re-working the sediments like earthworms do on land.

Shovel head worm, Magelona filiformis, first described off Plymouth in 1959

Although, I wear many different hats in the museum, one of my principle jobs is being a taxonomist. Taxonomy is the science of naming, describing and classifying life on earth. That may be finding new species, or re-describing species which were discovered many moons ago. When we find a new species, we draw it, take photographs of it (sometimes using Scanning Electron Microscopes enabling us to Zoom in really closely!), describe it and then pick a name for it in Latin. To give you an example here is a species that I described with colleagues in China.

Shovel head worm, Magelona equilamellae, first described off Southern France in 1964

So, what have we been up to recently? We have been reviewing the shovel head worms of Europe, of which there are currently nine species known. Four of which were first described from the UK, three off France, one off Portugal and one off Sweden. Although, these are worms we know, back when the species were first described we didn’t know all of the features/characters that we needed to know in order to correctly identify and seperate them. Unfortunately, this means that the worms get mis-identified, causing problems for people who monitor the health of our seabeds! This is where we step in, re-describing the species and producing identification keys and guides to help people in the future. Over the last year we have been busy reviewing the species, a paper on which has just been published. Now scientists all around the world will be able to correctly identify their European shovel head worms.

Eight species of shovel head worm found in Europe

We have been doing this with a Professional Training Year Student from Cardiff University, and colleagues from Spain and Portugal. 

 

Find out more about our work on ‘Worms that Dig!’

West African Worms that Dig 

More on West African shovel head worms

Species new to science, Shovel head Worms from around the world