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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?

Chara globularis/virgata (INTERMEDIATE)

TL(52) 92

905,264

19

Aldham, nr. Colchester, small pond in north east corner of Hoe Wood, in small quantity with C. vulgaris. Cortex with prominent primary rows giving ribbed appearance to axes, spine cells not developed into spines, stipulodes - single row of hemispherical bumps. Thus intermediate between C. globularis and C. virgata but closer to C. globularis. Coll: 19 May 2003. Peter &Pamela Wilson. Det. and described: K.J.Adams.

 

 

Chara virgata (Kutz.) R.D. Wood

(=C. delicatula C.A. Ag. non Desv. Including C. delicatula var. barbata (Gant.) J.Gr. & Bullock-Webster.)

This variety of C. globularis used to be regarded as a separate species, C. delicatula, but apparently intergrades with var. globularis, Moore et al (1986), although Stewart & Church (1992) still regard it as a good species. Its two secondary rows are distinctly narrower than the more prominent primary row, and its stipulodes and spine cells are usually more obviously developed. As the two are said to intergrade, however, some material may be intermediate. Since the relative development of the cortical rows is used as the main empirically defining character, all specimens will fit neatly into one variety or the other! It is important to observe the mature axial segments for this character, however, as in the younger segments the secondary rows may start off being narrower.

 

TQ/TL(51/52) 69/60

???????

18

Stock, as Chara delicatula var.. barbata (Gant.) .Gr. & Bull.-Webst., near Chelmsford, June 1893, Coll: E S Salmon, Det: Henry Groves.

Natural History Museum Herbarium (BM). Atlas Specimen. Nos. 672. Groves & Groves 1895.

TQ(51) 48

???

18

Lake nr. Wanstead. Undated ex herb. E Forster. (originally as C. pulchella hedwigii[=C. globularis], redet. by N E Stuart).

Natural History Museum herb.(BM).

TQ(51) 88

852,857

18

Leigh-on-Sea, small garden pond, (as C. delicatula C.A.Ag. non Desv.) July 1981, collected by John F.Skinner. Det: by K.J.Adams.

Pickled material in Natural HistoryMuseum Herbarium (BM) and the Southend Central Museum Herbarium (STD).