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Essex Field Club
Essex Field Club
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The weblog below is for naturalists to use to report interesting sightings, ask questions, report on field meetings and generally post pictures and any information or questions generally relevant in some way to the wildlife and geology of Essex. You will need to register and be logged-on to post to the forum, and you need to upload pictures first, for use in posts. Find out more

Fri 29th July 2011 19:32 by David Miller
Water-plantains (Alisma lanceolata and A. plantago-aquatica)
I'm entering dangerous ground as I'm attempting to be intelligent today. Alismas have been frustrating me for some while as we occasionally have A. lanceolata Narrow-leaved Water-plantain at Walthamstow Marsh, but I've never satisfactorily identified it, until today! I was never quite satisfied with doing it on just leaf shape and flowering time-of-day and the only other character is trickily described as 'styles arising c 1/2 way up fruit or in upper half'. Unhelpfully these arise inside the whorl of fruits and so you can't see them without carefully picking the fruits apart. This is normally outside the limits of my patience but I think I've got there now (I'll add a photo shortly).

Common Water-plantain is very common in the marsh's ditches but Narrow-leaved Water-plantain only seems to occur some years and is of course much less common when it does. It is currently showing well in the northern most ditch on the marsh by Coppermill Lane, but will get sprayed along with the abundant Crassula helmsii at some point. I notice that it is and Essex RDB plant. I've no reason to think it isn't native here. Feel free to deflate me with my conclusions if you think I'm wrong.

Keeping with the marsh the Creeping Marshwort Apium repens is having another really excellent year and the Brookweed Samolus valerandi is on a new high too as I counted about 115 flowering plants today and there are probably a similar number of rosettes. These are at the opposite end of the marsh to Coppermil Lane. Now is a good time to visit, though it's worth letting the Rangers know you're doing so (Tel. 020 89887565) as it's a sensitive area and there are 7 cows, Belted Galloways, in the southern field now. There are of course plenty of other good plants to see.

Reagrds, David Miller

Fri 29th July 2011 06:49 by Ben Sale
Chalk Carpet - Grays Chalk Pit
After much anticipation in hopefully one day finding this species again, we had one! coming to Don Down's 125w MV Tripod set-up over a sheet.

I believe this has not been recorded sice 1984? at that same locality, so pleased it is still down there.

Other species of note included Festoon and several Oncocera semirubella

Chalk Carpet Copyright: Ben Sale Festoon (Female) Copyright: Ben Sale Oncocera semirubella 2 Copyright: Ben Sale

Sun 17th July 2011 18:20 by Graham Smith
Spear Thistle deformity

The deformity you photographed may have been caused by a gall. There is something similar depicted in Margaret Redfern's and Peter Shirley's 'British Plant Galls'. It is not my subject, however, and I suggest you get in touch with the County Recorder Jerry Bowdrey. His address and telephone number are in the 2009/10 Essex Naturalist or are available through the website.

Graham Smith

Fri 15th July 2011 20:44 by Peter Pearson
Deformed spear thistle flower head
Over the past 3 months my wife and I have regularly walked a path at Highwoods Country Park, Colchester. At one point on the walk (TM009268) we have noted a spear thistle beside the path, just out of mower reach. When first seen we thought it was hosting a large caterpillar. Closer inspection revealed it to be a deformed flower head curled round in a crescent. This grew over time until it eventually caused the crown of the plant to collapse, and became a crescent of flower heads. We have never seen anything like this before and it would be interesting to known the cause of the phenomena. Is it something genetic in the plant or is there an outside cause.

Wed 13th July 2011 18:01 by Peter Harvey
Parasitised Stag Beetle
I may be wrong, but I am not aware of parasites which develop inside Stag Beetles - perhaps it could be the exit hole of another insect which develops inside corpses, with the stag beetle being the food in this case?
Tue 12th July 2011 20:35 by Peter Pearson
Parasitised Stag Beetle
On 11 July 2011, my grandson brought me a dead stag beetle, knowing that I would record it in the survey, which has been done. It was found in the footpath leading from St Cyrus Rd, to Chalfont Rd, Colchester, a footpath bordered by an ancient hedgerow and is a place where stags often appear. The beetle found was a female and unusually had a circular hole about 3mm in diameter in the rear upper abdomen which could have been the exit hole of a parasite. We have noted several dead stag beetles in the area over the years, but this is the first damaged in ths way. Could it have been a parasite ?


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