translucens

ESSEX BOTANY AND MYCOLOGY GROUPS

The Essex Records 1820 -2007.

Following the introductory paragraph to each taxon, the records are set out in columns. The first being the letter and alternative number (in brackets) code for the 100 x 100km square, followed by the 10 x 10km square number, arranged in conventional order from south to north, moving from west to east; the second column gives the 1 x 1km square or the 100 x 100m square Ordnance Survey grid reference if known; the third the vice county, and the final column the available details of the individual record. Approximate grid references for older records are suffixed by a?

Nitella translucens (Persoon) Agardh

This, the largest of our British Nitella species, has such giant (to 2mm diameter) axial cells that it has been prodded with microelectrodes and used to measure membrane potentials in different salt solutions, the vacuole contents being squeezed out and assayed by flame photometry for sodium, potassium and chloride ions, to try and work out how these ions are accumulated across cell membranes. It is unique in having a microscopically minute cluster of 2-3 dactyls at the tips of its otherwise single-celled branchlets. A distinctive form, with precociously developed branchlets, paired, monopodially arranged large-celled dactyls, and whitish bulbils developed on the nodes of the upper parts of the plant, - that are cross-connected by branchlets, so that the whole population forms a gigantic anastomosing network - has been found by the author twice, in Goldings Hill Upper Pond (Epping Forest). In 1989 it occurred in quantity, and I suspected that it might be ordinary N. translucens under the influence of a herbicide. The reappearance of this form in 1997, however, suggests that it has a genetic basis, and it will be described and illustrated in detail elsewhere.

TQ(51) 38	39 ,88	18	Snaresbrook, pool, 20 August 1897, Henry Groves	Two specimens in Natural History Museum Herbarium (BM). Atlas Specimen No. 2151.

TQ(51) 39	39 ,91	18	Woodford,'in gravel pit near the windmill', c.1820. Edward Forster. From note penned in margin of copy of Warner's Plantae Woodfordiensis	Essex Naturalist 19.p.229.1918-21
	39 ,92	18	Woodford Wells, 'behind Prospect House', Edward Forster. From note penned in margin of copy of Warner's Plantae Woodfordiensis.	Essex Naturalist 19.p.229.1918-21.
TQ(51) 49	??????	18	Pond near Woodford, June 1887. Henry Groves.	Natural History Museum Herbarium (BM)Atlas Specimen No. 2155. Bot. Ex. Club report for 1877-8.p.12.
	??????	18	Epping Forest, near Loughton, 'large tangled masses in a small deep pond' 13th August 1881. Henry Groves.	Five specimens in Natural HistoryMuseum Herbarium (BM). Atlas Specimen No.2154.
	??????	18	Pond near Loughton 22 July 1882. H. Groves. conf. N E Stuart.	DOR herb.
	??????	18/19	Epping Upper Forest. E. de Crespigny.	A New London Flora 1877. p.80.
	??????	18	Pond at Loughton, 14 September 1883. Coll: G. Nicholson, confirmed by Henry Groves.	Natural History Museum Herbarium (BM).Atlas Specimen No.2155.
	??????	18	Epping Forest, 26 June 1884. William R.Linton.	Natural History Museum Herbarium (BM)Atlas Specimen No. 2156.
	??????	18	Pond near Loughton, 23 July 1898. James Groves.	Natural History Museum Herbarium (BM)Atlas Specimen No.2157.
	??????	18	Epping Forest, near Loughton, 24 June 1916. James Groves.	Three specimens in Natural History Museum Herbarium (BM). Atlas Specimen No. 2158.
	??????	18	Loughton, 23 March 1918. George R.Bullock-Webster	Natural History Museum Herbarium (BM)Atlas Specimen No. 2159.
	??????	18	Hainault Forest, nr. Fair Holm Oak, 12 July 1835. Charles C.Babington.	Cambridge Herbarium (CGE).
	46 ,91?	18	Hainault Forest, 'found in a gravel pit on Hainault Forest on the left of the track from Fairlop to Hoghill', c.1820. Edward Forster.	Essex Naturalist.19.p.229.1918-21.
			Hainault Forest, 'with Utricularia vulgaris in a pit on 'Henhault' Forest,c.1820.	Essex Naturalist.19.p.232.1918-21.
	??????	18	Hainault Forest, c.1830. Ex: Herbarium Forster & Leighton,	three specimens in Natural History Museum Herbarium (BM). Atlas Specimen No. 2152.
	410,979	18	Epping Forest, High Beach,`with Typha by one large pond', (presumably Oak (Speakman's) Pond, hence grid ref. comment:: K.J.Adams). 21 July 1881. Recorder ?	Essex Field ClubTransactions. 2. p.41. 1881.
	409,963	18	Fairmead V2 rocket Crater, 1954, C.H.Selby:	"Some Aspects of Dispersal & Succession in some Epping Forest Ponds". Lon.Nat. 34. p.128 -141.(1955).
	418,984	18	Epping Forest, Lesser Wake Valley Pond West, present in huge quantities throughout the water column, sterile, in NW bay. Many whorls with very long dactyls, in addition to the normal minute ones. 23 August 2000; sill present in about the same quantity. 8 August 2001. K J Adams et FSC.
	418,984	18
	418,984	18	Epping Forest, Lesser Wake Valley Pond West, present in huge quantities throughout the water column, sterile, NW bay. August 2002. The third year running that this species has been abundant in the pond (though apparently absent in 2003). K J Adams.
	418,984	18	Lesser Wake Valley Pond West, abundant in NW bay, August 2004 and 2006 and July 2007. K J Adams. Population declining as rest of pond becomes putrid and dead 23 July 2008. K J Adams. No sign in 2009, 2010 or 2011. Pond now filled with putrifying leaves. Fully recovered in NW bay in July 2015. In 2016 in dense mats all over open areas with Elodea nuttallii. In dense mats in middle embayment only. 2 August 2020.
	419,984	18	Lesser Wake Valley Pond East, abundant along southern shore. 30 May 2006. K.J.Adams.
	419,984	18	Lesser Wake Valley Pond East, dense rafts with Nymphoides peltata in SW corner. 8 July 2007. K.J.Adams and 23 July 2008. . K.J.Adams.Still present as dense rafts, 12 July 2009; July 2010: and July 2011; K J Adams.
	419,984	18	Lesser Wake Valley Pond East, localized patches with Nymphoides peltata in SW corner. 17 July 2014. (Pond being invaded by Crassula helmsii) and in SE corner July 2015. K.J.Adams. Still present in lit area July 2016. Still some 2018. Vast quantities in 2019, choking pond.
	414,965	18	Epping Forest, Strawberry Hill Pond, abundant in large rafts confined to eastern bay, fertile. 31 July 2011. K J Adams.
	415,967	18	Epping Forest, Earl's Path Pond, in several large patches growing mainly near the eastern margin with **Elodea nuttallii, heavily encrusted with the tube rotifer Melicerta**. 24 April 1984. Coll: & det: K.J. Adams.
	415,967	18	Epping Forest, Earl's Path Pond, old plants with young apical shoots, in the shallows. 23 March 1989. K.J.Adams
	415,967	18	Epping Forest, Earl's Path Pond. Abundant, masses of oogonia and antheridia, southern and north-east side by the road, 24 March 1985. K.J.Adams.
	415,967	18	Epping Forest, Earl's Path Pond, small sterile plants in shallows on south east side of the pond. Oct. 1987; and 1988; April 1989: K.J.Adams
	420,987	18	Epping Forest, Wake Valley Pond, in second bay below inlet delta on north-east shore, ll December 1984. Coll: John Bratton. Det: K.J. Adams.
	429,981	18	Epping Forest, new form with nodal bulbils and precociously developed dactyls, Goldings Hill Upper Pond, 25 September 1989. Coll: & det: K.J.Adams, persisted until summer of 1990 when it fruited. K.J.Adams. New form found again with grapnel, growing with Ceratophyllum demersum, in deep water behind the island. 20 April 1997. Coll: & det: K.J.Adams
	429,981	18	Golding’s Hill Pond North. Abundant in large rafts obscured by fluffy-brown dead algal filaments, eastern margin shallows. Sterile. 25 March 2007. K J Adams. (first record since pond was scoured out).
		18	Goldings Hill Pond North, huge rafts all over the pond south of the island (surveyed from boat) 23 July 2008. Abundant and growing afresh all along southern margin in dense rafts 12 April 2009. K J Adams.
TQ(51) 69	610,906	18	Childerditch, abundant, free of epiphytes, sterile, eastern margin of Childerditch Upper Pond. Other aquatics present: Potamogeton natans and Callitriche *stagnalis* 12 September. 1987. Coll: & det: K.J.Adams (et LNHS).
	610,906	18	Childerditch, abundant in deep water, retrieved by grapnel c.3m south of north shore, Childerditch Upper Pond. 29 June 1991. Coll: & det: K.J.Adams et EFC. Pond ruined by fishing interests.2005.

TL(52) 81	???????	19	Tiptree, clay pits, as Chara translucens, 1858. Dr.Ezekiel G.Varenne.	Flora of Essex. p.406. 1862