142 The Essex Naturalist
year to year in Essex, but this should he available over the next few years by
following up our recent records. It is most reliably distinguished from the very rare
var. nidifica, by its antheridia and oogonia, which are both less than 0.5mm as
opposed to more than 0.5mm diameter, and from N. intricata by the string of sausage-
like-cells forming the branchlet termini.
TQ(52)47 596,794 18 Warren Farm Chalk Pit, shallow pool at northern
end, sparce, on grapnel, immature antheridia and
oogonia. 2 November 1987. Coll: & det: Tim Pyner.
Pickled specimen deposited in Southend Central
Museum Herbarium (STD).
TL(52)54 56 ,43? 19 Saffron Walden, near Monks Hall, in a ditch, c. 1850.
Collector? Gibson. Specimen in Saffron Walden
Museum Herbarium (SWN). Confirmed J.A.Moore.
TL(52)71 ??????? 19 Boreham, pond. 6 July 1880. Legit: H.N.Dixon.
Herbarium of James Groves. Natural History
Museum Herbarium (BM). Atlas Specimen No.
2257.
707,185 19 Lodge Lake agricultural reservoir, east of Leez Priory,
dense marginal raft along eastern section of north
shore, heavily encrusted, delapidated, and beginning
to break up and release numerous clusters of dark
coloured oospores. Growing with C. vulgaris var.
longibracteata and Potamogeton pectinatus. 19 July
1986. Coll: & det: k" J Adams.
TQ(51)99 ??????? 19 Paglesham, dyke by sea-wall, 1964. Coll: & det: Eric
Saunders. Flora of Essex, p.45. 1974.