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26th April 2014, woodland, Runcorn East, Cheshire | Photo: © RWD |
A young tree, older ones can grow to 40m high, with a wide rugged trunk and a broad crown. |
26th April 2014, woodland, Runcorn East, Cheshire | Photo: © RWD |
The leaves are oblong and usually broader at the base and with only a very short stalk (as opposed to the very similar Sessile Oakwhere the leaves are on longer stalks). |
26th April 2014, woodland, Runcorn East, Cheshire | Photo: © RWD |
Lobes rounded (on Sessile Oaksome lobes might be triangular at the end). |
26th April 2014, woodland, Runcorn East, Cheshire | Photo: © RWD |
The underside of the leaves. |
26th April 2014, woodland, Runcorn East, Cheshire | Photo: © RWD |
The tree is monoecious with both male and female flowers on the same tree. The male flowers are in long greenish-yellow knobbly catkins. |
26th April 2014, woodland, Runcorn East, Cheshire | Photo: © RWD |
Male catkins are between 2 and 4cm long with each flower having 6-8 stamens (up to a max of 12 stamens). |
26th April 2014, woodland, Runcorn East, Cheshire | Photo: © RWD |
Male flowers with each flower having 6-8 stamens (up to a max of 12 stamens). |
26th April 2014, woodland, Runcorn East, Cheshire | Photo: © RWD |
Male flowers yet to open. |
26th April 2014, woodland, Runcorn East, Cheshire | Photo: © RWD |
The brown 'scales' near the male catkins. |
26th April 2014, woodland, Runcorn East, Cheshire | Photo: © RWD |
Trunk is grey-brown with fissures. |
Easily mistaken for :
Hybridizes with : NEEDED : Female flowers, Acorns. |
There are many differing galls on Oak trees, the most commonly seen is the
Oak Marble Gall (harbouring Andricus kollari)
Common Spangle Gall (harbouring Neuroterus quercusbaccarum)
Silk Button Spangle Gall (harbouring Neuroterus numismalis)
Oak Cherry Gall (harbouring Cynips quercusfolli Similar size and appearance to Oak Marble Gall (about 20mm diameter)
Striped Pea Gall (harbouring Cynips longiventris
Pea Gall (harbouring Cynips divisa
A Gall (harbouring Neuroterus saliens
Cupped Spangle Gall (harbouring Neuroterus tricolor
Smooth Spangle Gall (harbouring Neuroterus albipes
An Oak Gall (harbouring Neuroterus politus
Kidney Gall & Waxy Pin Gall (harbouring Trigonaspis megaptera
A Gall (harbouring Macrodiplosis pustularis
A Gall (harbouring the gall midge Macrodiplosis roboris
Oak Apple Gall (harbouring Biorhiza pallida
Acorn Cup Gall (harbouring Andricus grossulariae
Acorn Knopper Gall (harbouring Andricus quercus calicis
Ram's Horn Oak Gall (harbouring Andricus aries
An Oak Gall (harbouring Andricus corruptrix
An Oak Gall (harbouring Andricus inflator
An Oak Galll (harbouring Andricus feccundatrix
An Oak Gall (harbouring Andricus curvator
An Oak Gall (harbouring Andricus quadrilineatus
Cola Nut Oak Gall (harbouring Andricus lignicolus
An Oak Gall (harbouring Andricus sieboldi
Hedgehog Gall (harbouring Andricus lucidus
An Oak Gall (harbouring Andricus grossulariae
An Oak Gall (harbouring Andricus quercusramuli
An Oak Gall (harbouring Andricus malpighi
An Oak Gall (harbouring Andricus callidoma
An Oak Gall (harbouring Andricus seminationis
An Oak Gall (harbouring Aphelonyx cerricola
Oak Apple Gall (harbouring Biorhiza pallida
A Current Gall (harbouring Neuroterus quercusbaccarum |
LAYS EGGS ON | CATERPILLAR | CHRYSALIS | BUTTERFLY |
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Purple Hairstreak |
GALLOTANNIN and TANNINS
Your Author is quite proud of his neat quasi-symmetrical drawing of GalloTannin, the reader should see the messy contorted drawings of it to be found on the internet!
Unlike
Oak trees are not the only plants to contain Tannic Acid, the gall nuts of Rhus semialata and the leaves of
The Tannic Acid (the mixture) is highly soluble in water and is slightly acidic with a pKa of about 10.
The Tannic Acid extracted from Oak Galls was made into ink for fountain pens by reacting it with iron in the form of Tannic Acid was also used for dying textiles as well as tanning leather, although many differing un-related substances have in the past been used to tan leather. Tannic Acid, mixed with an organic polymer and 2-ButoxyEthanol, is also used as a rust remover. Applied to rust it forms the bluish-black Ferric Tannate which will clean off easily. See also Ellagitannins.
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Quercus | robur | ⇐ Global Aspect ⇒ | Fagaceae |
Quercus (Oaks) |
Beech Family [Fagaceae] |